This won't impact Synchronet as it has a separate signal handling
thread, but we still need to behave properly for processes that
don't.  I'm also saying that ENOMEM does not indicate a disconnection,
though it may be better to pretend it was disconnected...

Hopefully not introducing any bugs in the process.

Hopefully not introducing any bugs in the process.

Don't prompt a new user to forward email to their netmail address if they
provided an invalid netmail address (not supported by the system).

If a sysop has an invalid netmail address setup for forwarding, don't try to
forward email (or new user feedback) to that address.

Re-ordered the new user terminal questions a little bit (ask for the backspace
key first, to get earlier manual PETSCII detection). I'm not sure why I was
enabling AUTOTERM along with PETSCII before. Removed that as PETSCII cannot
be auto-detected.

Eliminate the hack in each server where it will over-write startup host_name
(with the configured Internet email address), if it's blank. This hack was
subject to a race condition where the parent app (e.g. sbbsctrl.exe) would
clear or re-initialize the host_name after the sever threads had initialized.
Instead, just use a function which will return either the startup->host_name
or (fallback to) scfg.inet_addr.

auxattr flag since we normally want the attach file to be deleted automatically
when the message is delivered. SBBSecho now won't be deleting the file
attachment unless this flag (or the .msg \1FLAGS "KFS" equivalent flag) is set.

to putmg() when displaying messages in the sub on the terminal server.
E.g. to disable word-wrap for *all* messages displayed in a sub, set P_WORDWRAP
in sub_t.n_pmode.

fidodefs.h:47:27: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
 #define FIDO_CHARSET_UTF8 "CHRS: UTF-8 4" /* FTS-5003 */
                           ^
writemsg.cpp:645:15: note: in expansion of macro 'FIDO_CHARSET_UTF8'
    *charset = FIDO_CHARSET_UTF8;

(e.g. applies to email and netmail now too).

(default: off) - when enabled, the current terminal width (columns) will be
saved in the msg header.
When using the internal msg editor or raw intput mode, the columns are always
saved in the message editor. fseditor.js should have this option enabled.

(JS bbs.post_msg()): If the WM_QUOTE mode flag is *not* set, then it will auto-
create the quote file (quotes.txt) and add the WM_QUOTE mode bit before calling
sbbs_t::writemsg(). So if existing JS scripts call bbs.post_msg(..., WM_QUOTE)
with a custom-created quote file (e.g. with msg tails), that'll still work as
before (e.g. DDMsgReader.js).

bbs.email() and bbs.netmail() now support an optional reply_header_object
argument which works like bbs.post_msg(). These methods (and the underlying
C++ methods: sbbs_t::email(), netmail(), inetmail(), all auto-create the
quote file now, when the WM_QUOTE mode flag is *not* set.

The auto-created quotes.txt now includes the plain-text version of MIME-encoded
messages.

the bbs.post_msg(), email(), and netmail() methods now all support reply
header objects that came directly from bbs.get_msg_header() *or* copies of
such header objects (but the auto-quoting feature won't work when supplied
this type of header object). So if passed a header object returned from
bbs.get_msg_header(), we can now use the message base (for auto-quoting) and
the underlying msg storage directly (no JS parsing necessary). This is what
the new js_GetMsgHeaderObjectPrivates() function is used for.

js_ParseMsgHeaderObject() (and the underlying parse_header_object() function)
now supports either an actual internally-generated msg header object (e.g.
returned from bbs.get_msg_header()) or one that is a copy or hand-constructed.

quotemsg() no longer tries to get a copy of the msg index/header. It shouldn't
have to since we can now get to underlying msg storage in the js_msgbase.c
via js_GetMsgHeaderObjectPrivates().

quotemsg() now reads only the plain-text portion of MIME-encoded messages.

As part of this effort, I modernized the method prototypes using default
argument values (e.g. WM_NONE for wm_mode arguments) and removed some
extraneous WM_EMAIL and WM_NETMAIL specifications (these wm_mode flags are
automatically added by the sbbs_t::email() and *netmail() functions).

savemsg() now *does* support reply-IDs/thread-linkage via the additional
'remsg' argument (when non-NULL).

Replaced some use of nulstr with NULL.

Replaced more boilerplate SMB open code with calls to smb_open_sub().

So I created a single add_msg_ids() function (mostly migrated from postmsg.cpp)
to make this incredibly easy so any/everywhere that adds a message to a message
base should be able to call it. This function also creates reply-IDs (when
relevant) and program ID (Fido-PID) header fields:
- FIDOPID (always)
- FIDOMSGID (if an echomail post)
- FIDOREPLYID (if an echomail reply-post)
- RFC822MSGID (always)
- RFC822REPLYID (if a reply)

message text (when relevant and available) - this helps when re-wrapping the
message text (e.g. for quoting) and not always guessing "80 columns".

sbbs::lputs() will log the current user alias already, logline()->lputs() would
create log messages with the user alias twice.

- similar to what we do in netmail() with the WM_NETMAIL flag.
If you call writemsg() without WM_EMAIL set, it tries to use the subnum as an
index into the sub-board array and will crash.

attachment is attempted but unsupported.

logic everywhere.
Enforce the sys_misc SM_DELREADM flag (SCFG->Message Options->Kill Read E-mail)
in more places (set the Kill After Read flag automatically).
Create a Message-ID (RFC822-style) for locally created email messages.

addresses (e.g. FidoNet and QWK) using the new smblib feature.

writemsg() now handles the anonymous name in the drop files (using WM_ANON
for the first time?).
A little mixed-case NETMAIL.MSG paranoia (for case-sensitive file systems).
More use of SAFEPRINTF().
More use of removecase().
More attribute flags represented (with a single character) in the 'A' column
of mail and sub-board message listings.

files and editors have the correct sender name in all situations (not just
when posting on "real name only" sub-boards).
"ANONYMOUS" postings work too, but mainly Internet & FidoNet Netmail were fixed.
Use removecase() for NETMAIL.MSG (in case there's a lowercase version).
Use subj in place of title and to in place of dest in argument names.
Some constification of argument types.

was never used. This was intended to be a method for internationalization,
letting the sysop change which key is used as the uiniversal "quit" key.
This commit replaces most of the uses of the hard-coded 'Q' for quit wtih the
3rd charcter in the text.dat YNQP string. Some hard-coded menus still have the
'Q' key hard-coded and will need to be addressed later. The text.h YN index
macro was changed to YNQP and the JS text index variable name will change
as well.

to allow the caller to skip the question (ie: for new user feedback validation)
This replaces the "never prompt for validation user" patch since:

DigitalMan: I suppose if someone has an issue, a new mode bit could be burned for that

Is clearly permission.

to forward to external mail address), don't prompt the user if they wish to
forward (always forward).
More safe string copying/formatting.

all exported functions and data types using a 32-bit time_t (time32_t).

especially through SMTP (where these values are exposed via the Originator-info
header field): SENDERUSERID, SENDERSERVER, and SERVERTIME.

unlimited number of emails per day.

That is, if any of the following text.dat entries are set to a blank/emtpy
string (by editing ctrl/text.dat or via run-time script modification), the
question will not be asked of the user allowing greater sysop-customization
of hard-coded processes (e.g. new user application):
ClearUploadQueueQ
ClearDownloadQueueQ
HangUpAfterXferQ
ChatWithGuruInsteadQ
ForwardMailQ
DownloadBatchQ
LogOffQ
DeleteErrorLogQ
ClearErrCounter
DeleteGuruLogQ
AutoTerminalQ
AnsiTerminalQ
ColorTerminalQ
ExAsciiTerminalQ
CallingFromNorthAmericaQ
ReadYourMailNowQ
NScanAllGrpsQ
SScanAllGrpsQ
NewPasswordQ
ContinueQ
EnterYourPhoneNumber
UserInfoCorrectQ
UseExternalEditorQ
DownloadAttachedFileQ
AddSubToNewScanQ (new)
RemoveFromNewScanQ
DisplaySubjectsOnlyQ
Post
SearchExtendedQ
ViewSysInfoFileQ
ViewLogonMsgQ
WithLineNumbersQ

inserting (long) typedefs to prevent warnings, but in the case of the JS File()
class, actually supporting file lengths > 32-bit.

Added FTN PID header field to all messages created by sbbs.

Don't prompt for "delete mail from everyone" when there is only one e-mail
waiting for the user.
Use some existing text.dat entries (some old and some recently added) where
identical static strings were still being used for no apparent reason.
Added several text.dat entries for the QWK settings menu, node status, and
some other single-line messages (replacing static strings).