Added email.can and subject.can checking as sysop-configurable SPAM filters.

Fixed potential NULL pointer de-reference bug (new).
Added support for external address aliases (you@somedomain.com  = sysop) in the alias.cfg file.
Now store original destination address in "name" field of SMB header.

Eliminated redundant BOOL/TRUE/FALSE definition.

Doesn't wait for keystrokes if stdin is not a console, just sleeps forever.
Various signal handlers installed to allow sbbs to clean up itself properly.

Fixed prep_dir() for use on FreeBSD - _fullpath (macro for realpath) initializes the entire MAX_PATH bytes of the destination string.

Removed multiple variable declarations using commas (each var has its own type specified).

This increases the likelyhood of detecting RIPscrip support properly in RIPtel.
Also changed the extra response info delay method (to 1 yield per char rx'd).

recvline method will now truncate \n terminated lines (no \r) correctly.

Added real IP and hostname if different from sender's stated address.

1. was incrementing buffer char pointer even when there was no new data
2. was not releasing time-slices when there was no new data