Should put all the applicable keysyms from /usr/openwin/lib/X11/XKeysymDB
into the keymap table in canvas.c

There are also some vendor keysyms
in /usr/include/X11/DECkeysym.h
and /usr/include/X11/Sunkeysym.h
and /usr/include/X11/ap_keysym.h

I'm not sure if these are in XKeysymDB or not, but we should probably
#include these .h files into canvas.c