Fixed beep() method when called with no args.

Created beep() method to send beep characters to remote console.
ansi_gotoxy() method now accepts a single object argument with x and y
properties (like that returned from ansi_gotoxy), or separate number arguments
for x and y values (as before).
All ansi_* methods now have aliases without the ansi_ prefix, in preperation of
supporting other (non-ANSI) terminal emulations in the future.

for full-screen editor functionality.
Added support for CON_DOWNARROW, CON_LEFTARROW, and CON_BACKSPACE console
status bits, used in combination with getstr(K_LEFTEXIT)  for full-screen
editor functionality.
Insert mode (^V) still needs work.

for full-screen editor functionality.

CON_DOWNARROW, CON_LEFTARROW, and CON_BACKSPACE, used to determine when
getstr() is terminated with arrow key/backspace movement.
Used for full-screen editor functionality.

RLogin connections establishment.

Sets the terminal variable to "ansi", "rip", "wip", "html", or "dumb" if it's
not otherwise initialized via Telnet or RLogin.

Added "env" global object (associative array) that contains all of the current
environment variables (for CGI execution).

for executing Synchronet JavaScript modules as background timed events (e.g.
newslink.js) or in places where JS modules are not currently supported (e.g.
mailproc.cfg). This will likely be enhanced to support CGI execution in the
near future allowing dynamically-generated HTML using Synchronet data on any
web server (e.g. Apache).

the length is 0.
smb_addcrc() now verifies the file is evenly divisible by 4 bytes (the size of
a 32-bit CRC record).

Added sbbs_t::terminal for terminal type description (e.g. "ANSI").

Added multiple-inclusion protection.

existence check on Unix (fexistcase).

Does QUOTES.TXT need to be created/delete when there is no external editor?

Updated brace style.
printfile_fp() no longer reads/displays in 8K chunks, fixes problem with
pauseon/off @-codes in large files.

Better file length and read error checking in printfile() and printtail().

Supports smblib 2.22, which can return static to/from/subj convenience pointers
(on corrupted message headers).
Changed calculation of message header size (in bytes) - no looping.

Changed mime blurb.

required header fields (to/from/subj) is missing. Instead, it just points the
convenience pointer(s) for the missing field(s) to a static null string.
Increased version to 2.22.