- rename unicode_tty_glyph_width() as qe_wcwidth()
- compute tables for qe_wcwidth() with tools/unicode_gen.c
from the latest Unicode version
- add qe_wcwidth_variant() to determine if terminal may use
incorrect width for a given glyph.
- reposition TTY cursor for glyphs with ambiguous width
- remove unicode_width.h
- add wcwidth.h and wcwidth.c generated by tools/unicode_gen.c
- update tools/unicode_gen.c and tools/unitable.c
- determine Unicode version support at start time
displayed by describe-screen command
- display code point width and variant in what-cursor-position command (C-x ?)
- bumped VERSION to 5.3.4x
