+ compiler warning fixes for test programs.
+ various build-fixes for test-programs with pdcurses.
+ updated configure checks for X packages in test/configure from xterm
#267 changes.
+ add configure check to gnatmake, to accommodate cygwin.
+ change test/ditto.c to use openpty() and xterm.
+ add locks for copywin(), dupwin(), overlap(), overlay() on their
window parameters.
+ add locks for initscr() and newterm() on updates to the SCREEN
pointer.
+ finish table in curs_thread.3x manpage.
+ change winnstr() to stop at the end of the line (cf: 970315).
+ add test/test_get_wstr.c
+ add test/test_getstr.c
+ add test/test_inwstr.c
+ add test/test_instr.c
+ 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,
