Loading empty main.ini file results in no (0) command shells be configured, but this scenario needs to be supported if we are to be able to run upgrade_to_v320.js via jsexec when there is no ctrl/main.ini file.

Only the terminal server cares about command shells, so just move the checking and critical-error reporting there.

was always returning 0 (oops), so user.tab searches for specific string values
(usually user's real name) did not work.

max_files, max_age, seq_dev

To match the existing JS file_area...dir_list properties.

These were mismatched between cnfdefs.js and scfg*.c already, so lets
fix but make more consistent with the JS object model.

So extended internal codes (e.g. for msg and file areas) now have a max length
of 32 chars (16 prefix, 16 suffix) and most other internal codes are now
limited to 16 chars (instead of 8).

My hub (1:218/700) is currently having what appears to be a TCP/IP
connectivity issue that was resulting in infinite "Send failure"
log messages and "We got an M_EOB, but there are still N files pending M_GOT"
log messages.

I first added better socket-send failure detection (checking return value of
sendCmd() and sendData() where needed) and then noticed that failure to send
a file was not detected (the sending.file.position is advanced even if
sendData() fails), so now handling that condition too.

Also added more diagnostics around socket-send failures (is socket writable?)
in this particular case, the socket is not writable and socket-send is
returning 0.

This is pretty much a direct port using the *almost* exact same
form definition file, except:
1. Uses sbbs.dll for common functions
2. Read config file (main.ini), so now needs SBBSCTRL env var set
3. Some minor improvements, like hour-glass cursor while searching
   and re-reading/loading/displaying the user data when any changes
   are saved.
4. Supports the v3.20 user base (obviously)
5. Flags nodes in-use by modified users with the UDAT node flag

Some old bugs (e.g. the user credits were read/written from the old/wrong
byte-offset) are no longer relevant.

This should be used elsewhere too.

putuserdatetime() needed to take a time32_t argument to be compatible with
Borland C++ Builder. Eventually, when we stop using that tool, we can move
to just 64-bit time_t's everywhere.

parseuserdat() now accepts and optional array of field pointers to populate
for each user field (for use with the new UserEditor.exe).

exempt->exemptions, rest->restrictions, cdt->credits

As reported by Max (WESTLINE)

This would crash/segfault when the .ini files didn't exist

This adds a Ctrl-A code in the notification subject, so needs latest
postmsg.cpp or that Ctrl-A code will end up in your email/inbox too
(not really supported or stripped when sent over POP/SMTP).

We may want Ctrl-A sequences in the telegram subject, but not in the message
subject

Will notify the sysop via email and telegram when a new user account has
been created. For Morpheus (MORPHEUS)

... unless a comma is actually required.

Somehow, new users on Vertrauen *still* manage to answer "Yes" to both the QWK
Networking account questions, accidentally creating a QWKnet account that's
not useful for normal BBS user activities. So print a very clear "alert" style
message making it even-more clear that the account they are creating will ONLY
be useful for QWK Networking activities.