Future Things to add:
	menus for extra options
	auto-saving
	Emacs-like tags
	Maybe change global vars to be in a single BETH array.
	Fix tab support (how?)

Possibilities:
	spellchecker (maybe with tkispell)
	Integrate Beth with other Tk apps.
	Maybe have graduated reading cooperate with addinput or BLT's bgexec, for a smoother operation & true background performance.

