will be sending 0x7f (DEL) when the backspace key is struck: SWAP_DELETE
For example, xterm sends 0x7f when backspace and hit and an ANSI escape
sequence when the DEL key is hit.

I don't yet have a way to *enable* this setting.

Also, allow the user's setting of NO_EXASCII to take effect even when
auto-terminal type detection is used (yes, the user's terminal can support
ANSI and *not* CP437).

the user's your-scan config (&S using the default shell) even when
"Display subjects only" was confirmed. Previously, when only subjects were
shown, all subs were scanned regardless of user config.
Bug reported by John Hiemenz, thanks!

- DELAY:nn (delay nn 10ths of a second)
- POS:nn (move cursor to position nn, not sure if nn is 0 or 1-based)
- CLREOL (same as CLR2EOL)
- YESCHAR (the character/key for "Yes", from text.dat YNQP string)
- NOCHAR (the character/key for "No', from text.dat YNQP string)

and for good measure:
- QUITCHAR (the character/key for "Quit") - not supported by PCBoard

QOFF - user cannot abort the display of the file
QON - user can abort the display of the file

@X00 saves the current color and @XFF restores that saved color.
Thanks to NuSkooler for the PCBoard manual, which is pretty good.

- getnameinfo() was being called with NI_NUMERICHOST in the mail server and
  web server (but nowhere else)
- use a singly-defined macro (STR_NO_HOSTNAME) for the "<no name>" string
  rather than copying it about
- the webserver apparently assumes that session->host_name will always have
  *some* unique value (e.g. the IP address when no hostname is available) - so
  account for that special need <grumble>

(e.g. "<service> connection accepted from: <ip_addr> port <num>").
Some strcpy->SAFECOPY, sprintf->SAFEPRINTF replacements for good measure.

(i.e. posted to yourself). It's confusing when testing the scan for messages
"to you" if messages also *from* you aren't listed. :-)

Don't allow the use of -if, -ix, -ic options when not a *nix build.

terminal width) - only used when the QUOTEWRAP option is set. Common values:
0 - current behavior, wrap the quote file to the current terminal width
80 - wrap 80 columns specifically (actually, 79)
9999 - unwrap to long lines (one line per paragraph)

terminal width) - only used when the QUOTEWRAP option is set. Common values:
0 - current behavior, wrap the quote file to the current terminal width
80 - wrap 80 columns specifically (actually, 79)
9999 - unwrap to long lines (one line per paragraph)

Actually, previously it was wrapping to current terminal width minus 4 when
QUOTEWRAP was enabled. Now, make that current terminal width minus 1
(when quotewrap_cols is set to 0).

When responding to AreaFix requests, it's normal for create_netmail() to be
called with a NULL 'msg' argument value - so don't try to dereference it
(for the "cols" header field value) if it's NULL. Thanks to Mark Lewis for the
bug report.

(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.
In SCFG, this option is called "Record Terminal Width".

(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.

MIME-encoded/embedded attachments.
We probably will want to do this for SMTP-posted messages (to subs) too.

indicate that a message's body text contains one or more MIME-encoded/embedded
attachments - so that entities won't have to parse the message headers/body
to determine whether or not a message has MIME-attachments.

*_net_type hfield has a value of 0 (NET_NONE) - according to smbdefs.h.

console.msghdr_top_of_screen):
a hack to let scripts know whether the most-recently displayed message header
was displayed on the top of the terminal screen (or not). This allows us to
show avatars at the top of the screen when the header is up there, rather than
relevative to the bottom of the header (the pos can vary, depending on stuff).

strrchr() here to find terminating chars (quotes, parens, brackets).
e.g. '"Joe Shmoe" <joe@shmoe.com>, "Fred Smith" <fred@smith.org>'
would be parsed as 'Joe Shmoe" <joe@shmoe.com>, "Fred Smith'.

'data_length', but not always (e.g. may include text from some header
fields, excludes any non-text data fields).
Mark 'data_length' msg header property as read-only.

back in 1993, but were never needed/used.

sendfile() no longer logs "attachment" when a file description is provided.

download_file_attachments() and expose via new JS "bbs" method. Currently
this only reall works for the mail base.

since the smb_t already contains a subnum and we were passing a pointer to the
sbbs_t::smb to lower-level called-functions anyway.
Let's not mix-up class-scope with function arguments.

Fix the missing carriage-returns in the shell (bash) prompts by always building with the stderr logging
support (in *nix builds) - but run-time disable as desired via EX_NOLOG option. I've been wanting to get
rid of that "XTERN_*" macro for a long time anyway (it's "XTRN" damn-it!). :-)

intercepted output to stderr won't be logged.

Since QUOTEWRAP *is* used, just define that bit flag specifically.