updated ABOUT to include unicode sources
added Bulgarian MIK unicode table
added more Unicode sources to ABOUT
Merge branch 'master' into feature_dbcs
erase full full-width character on delete or backspace
make backspace, delete and arrow keys character-width aware
make backspace, delete and arrow keys character-width aware (better)
correct (if slow) redrawing behaviour on dbcs delete
slightly faster dbcs delete
simplified put_screen_char_attr
much faster dbcs backspace/delete
Merge branch 'feature_dbcs'