Last string checkin

[Dan Sugalski]

Okay, I've made the final checkin to the string branch, one that
SKIPs the tests that fail because of the (very temporary, I hope)
lack of unicode support.

The branch is ready to get merged into the trunk and we can deal with
the fallout from that. Unfortunately this is *not* quite as finished
as I'd like it to be, but it does work and things are stubbed in
enough to let folks with more time can fill in the blanks. Basically
everything works except the dynamic loading of encoding and charset
libraries -- right now the basic ones are yanked in at compile-time.
The string.c guts likely have more knowledge of things than they
ought to as well, but that's not going to get shaken out until we
have a real variable-width encoding and multi-codepoint charset
working. (Like, say, unicode... :)

Anyway, I'd like to get this merged in. If a few folks could try and
give it a whirl I'd much appreciate it.
--
Dan

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