+ add new functions to lib_trace.c to setup mutex's for the _tracef()
calls within the ncurses library.
+ for the reentrant model, move _nc_tputs_trace and _nc_outchars into
the SCREEN.
+ start modifying test/worm.c to provide threading demo (incomplete).
+ separated ifdef's for some BSD-related symbols in tset.c, to make
it compile on LynxOS (report by Greg Gemmer).
+ add continuous-move "M" to demo_panels to help test refresh changes.
+ improve fix for refresh of window on top of multi-column characters,
taking into account some split characters on left/right window
boundaries.
+ add "widec" row to _tracedump() output to help diagnose remaining
problems with multi-column characters.
+ partial fix for refresh of window on top of multi-column characters
which are partly overwritten (report by Sadrul H Chowdhury).
+ ignore A_CHARTEXT bits in vidattr() and vid_attr(), in case
multi-column extension bits are passed there.
+ add setlocale() call to demo_panels.c, needed for wide-characters.
+ add some output flags to _nc_trace_ttymode to help diagnose a bug
report by Larry Virden, i.e., ONLCR, OCRNL, ONOCR and ONLRET,