This macro has expanded to nothing for a while now and even before, the usage was misguided and unnecessary as explained in this video: https://www.youtube.com/watch?v=cjotPqQxxAY

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...

The goal of this commit is that: only modules that either are part-of sbbs.dll/libsbbs.so or need to link with/use that library, will #include "sbbs.h" and thus be dependent on its subsequent includes (e.g. cryptlib.h, jsapi.h). This should mean extdeps.mk can be trimmed way down.

I also removed CVS keyword/comments and trimmed up the boilerplate copyright notice in modified and added source/header files in this commit.

There is no functional change in behavior in this comment.

I'm fed-up with MSVC assertions in ctype functions (e.g. isdigit, isprint, isspace, etc.) when called with out-of-range (e.g. negative) values.

This problem only affects MSVC debug builds, but if you run them (like I do), these things are like little time bombs that can drive you crazy (knocking your board out of service).

The new macros names are bit more descriptive as well.

more (!) by removing the sections from the total file string list, once parsed.
Fixed a couple of minor and unlikely off-by-one errors with message ptrs
based on date/time.

users) and adjusting scan ptrs by date or set to "Last msg" while online:
- speed (on my system, reduced from 12 to < 2 seconds)
  This involved 2 enhancements: check msgbase index file timestamp (fast)
  before opening any files. When opening the msgbase, just open the index
  file (no other msgbase files) - required new smblib function: smb_open_index.
- fixed off-by-one when setting by date (when setting the new-scan ptr to
  Jan-1-2018, you want that first message posted on/after Jan-1-2018 to be
  found as "new", not the first message posted *after* that date.
- re-added the fixmsgptrs() call in putmsgptrs(), inadvertently removed
  in the .ixb -> .ini ptr storage update in rev 1.192 of userdat.c.

file (msgdate) so that modules that use date_str.c will not require smblib too.