Should rework how this filtering stuff is organized at some point.

Put new messages at actual bottom of frame, not just visible area when scrolling, but don't scroll down if in scrollback mode.
Re-fix problem with non-string values from inputline.

JS's console.getkeys(). If no mode value is specified, K_UPPER is the default
behavior (same as before). *.getkeys() currently only recognizes the following
mode flags:
- K_UPPER
- K_NOECHO
- K_NOCRLF

K_NONE (0) is also a valid value.

declaration

MSVC had no problem with this. <sigh>

Use this in place of JS_GetPrivate() in native class methods that need the
class instance's private data pointer and will do bad things if that pointer
points to something other than what is expected. mcmlxxix (matt) discovered
that using Object.apply(), you can invoke class methods where the 'this'
instance is a different class. This would result in
"Internal Error: No Private Data." or a crash.
So now, gracefully detect this condition and report a meaningful error:
"'<class-name>' instance: No Private Data or Class Mismatch"

Also, important to note: if the method uses JS_THIS_OBJECT to get the JSObject*
to pass to JS_Get*Private, then it must do this *before* it calls JS_SET_RVAL.

From jsapi.h:
 * NB: there is an anti-dependency between JS_CALLEE and JS_SET_RVAL: native
 * methods that may inspect their callee must defer setting their return value
 * until after any such possible inspection. Otherwise the return value will be
 * inspected instead of the callee function object.

The js_crypt*.c files still need this treatment.

the 'keys' argument is optional. If no keys are specified (or NULL), then any/
all non-numeric keys are considered valid input and may be returned by this
function/method.

as well as the auxattr "Attach" when either FILEATTACH or MIMEATTACH is set
(requires an updated MsgAttr line in text.dat).

I know... this list of %s's was a bad idea to begin with, but oh well.

after sending via POP3 (the MSG_READ attribute flag is already indicating that).

purpose

- votes
- priority
- delivery_attempts

headers).
Don't reference the (currently unused) times_downloaded and last_downloaded
msghdr_t elements/properties.
Set the current node action value *before* calling the scanposts_mod
("Scan Msgs module") in sbbs_t::scanposts().

the (never used) SMB_PRIORITY 32-bit hfield (0 = default/highest priority), to
a new fixed message header field (8-bit) following the X-Priority header field
numbering scheme: 1 = highest, 3 = normal, 5 = lowest and 0 = unspecified.

or copy/pasted definitions (e.g. USER_ANSI)

or copy/pasted definitions (e.g. RFC822HEADER).

This file should always be require()'d and not load()'d to avoid constant
redefinition errors.
Also added missing definitions:
- FIDOCTRL
- FIDOSEENBY
- FIDOPATH
- RFC822HEADER
- SMTPRECEIVED

userdefs.js and require() it from sbbsdefs.js, so no existing scripts that
use these constants should need to change.
This allows:
1. use of const over var for proper JS constant definition via require()
2. more optimal load()ing of only what you need for your script to execute

"Nope" is not an acceptable description of available support channels.

!JavaScript  /sbbs/exec/newslink.js line 936: Error: Error -110 adding
RECIPIENTADDR field to message header

This is likely because we're trying to auto-detect the network-address type
and failing, so just force it to NET_INTERNET here.

other relevant "To" field value exists in the header.
Include the X-FTN-SEEN-BY and X-FTN-PATH header fields, if present.

Expanded codes will not *not* go beyond the terminal column width (minus 1).
If you need the old/wrap behavior, add a "-W" modifier to your @-code.
If a length value is specified with -W, it is ignored.

- MSG_TO, MSG_FROM, MSG_SUBJECT now reflect the header values passed
  to sbbs_t::show_msghdr(), JS bbs.show_msg_header() and not necessarily the
  actual stored (e.g. MIME-encoded) header values.

New codes:
- MSG_CC - reflect a message's CC list, if it has one
- DATETIMEZONE - combines DATETIME and TIMEZONE in one string

used to display a CC list, when applicable.

"read mail" module is executed, so that the node action is correct more often.

show_msghdr(), over-riding the values from the passed smbmsg_t. This is useful
for, say, displaying MIME-decoded values rather than the MIME-encoded versions
of the header fields that you often find in email today.

Copy the upvotes, downvotes, and total_votes to the smbmsg_t, replicating
what is done in sbbs_t::scanposts() - these are used by sbbs_t::show_msghdr()
so we need to copy them if we're going to be replicating that functionality
(showing up/down votes and score) in message headers shown with bbs.show_msg()
and bbs.show_msg_header().

  "Upper case should be used"
Compared with RFC0245 Quoted-Printable encoding:
  "Uppercase letters must be used"

<sigh>
Really.. these specs were written by the same (MIME) working-group?

output.
Added a "include_offset" option to the generate() method.

converted to spaces.
Stripping control chars from decoded header values too: we don't want
someone getting cute w/embedded Ctrl-A codes or ANSI escape sequences.