I've likely broken something though, so if you see weird behaviour with
extended ASCII, let me know please.

as a command-line option can be problematic with *nix shells.

by properly const-ifying the appropriate functions and variables.

Not yet tested on Win32

startup option - we will *always* use the local timezone. If the sysop wants to
use GMT/UTC, they should configure their operating system accordingly.

uploaded to include the list output.

No more temp files in data or data/temp.
ctrl_dir/../temp (e.g. sbbs/temp) is the new default temp dir.
Each server has its own separately configurable temp dir.
BBS events (e.g. QWK packet processing) now have their own exclusive-use
temp dir (e.g. sbbs/temp/event).
All server threads will attempt to create and verify the validity of their temp dir.
System temp dir is only the default global temp dir for Unix (i.e. /tmp), since
the Windows default temp dir (e.g. C:\DOCUME~1\Rob\LOCALS~1\Temp) is not
particularly friendly or attractive.

or longer, uses a passed 'buflen' parameter to determine the truncation point.

Using memset() inplace of non-standard strset().