digraphs are ligatures about isetools HOT 3 CLOSED

This one's complicated. It'll require changing the lexer, grammar, dombuilder, dropping the digraph class, mangling a bunch of transformers and validators, and mangling a bunch of test classes.

Doable, but not simple.

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Looking at it a little more, it seems like it would make sense to unify the unicode and digraph classes. They both represent the same thing: a single unicode character.

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I need to be able to handle digraphs (and other ligatures) as individual characters, not just as single precomposed unicode letters. For example, I generally want to use {ffl} and {db} as "ffl" and "db" respectively, and only in some special ligature mode would I possibly replace these with the precomposed unicode form (or possibly just turn on the font's own ligature handling). On the other hand, I'd never want to treat {th} as "th" or {&amp} as "&amp".

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