+ improve cleanup() function in lib_tstp.c, using _exit() rather than
exit() and checking for SIGTERM rather than SIGQUIT (prompted by
comments forwarded by Nicholas Marriott).
+ reduce name pollution from term.h, moving fallback #define's for
tcgetattr(), etc., to new private header nc_termios.h (report by
Sergio NNX).
+ two minor fixes for tracing (patch by Vassili Courzakis).
+ improve trace initialization by starting it in use_env() and
ripoffline().
+ review old email, add details for some changelog entries.
+ quiet some pedantic gcc warnings.
+ modify _nc_wgetch() to check for a -1 in the fifo, e.g., after a
SIGWINCH, and discard that value, to avoid confusing application
(patch by Eygene Ryabinkin, FreeBSD bin/136223).
