CON_R_ECHOX and CON_L_ECHOX, then sends "\b \b"

Replace all instances of [br]puts("\b \b") with call to backspace()

This fixes once and for all the "spaces entered at password prompt are
echoed as spaces" problem.

Har.

PR:42->closed

fixes a problem with an uninitialized timeleft value being displayed when
popped into local sysop chat from the login prompt.
PR: 38

effect while waiting for paged node to respond (or the wait to be aborted)
by calling inkey(), which also gives us the yield needed (replacing the
SLEEP(500) call), but the yield is immediately aborted when a key is hit.

(shared-write) files.

every second of inactivity.

Improved Guru realism, particularly when in "local chat" with Guru: Guru won't
repeat himself/herself and waits for user to stop typing (including word wrap)
before responding.

Checking return value of getnodedat() before calling putnodedat().

module (.js or .bin) files.

variants (gmtime_r, localtime_r, and ctime_r) for thread-safe operation on Unix

outside the sbbs_t class).

GMT/UTC.

Added pause prevention at private msg prompt.
Removed unused code.

Added underscores to local 'and' and 'or' variables in guruexp() to (hopefully) solve conflict with new GNU CC.

Increased size of str and cstr local variables to guruchat() function hopefully fixing pointer (ptr) bug.

Each function that requires a temp string variable, now has its own "tmp" local variable.