+ 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,
