Character sorting and comparison

[Dan Sugalski]

Comparison was the one thing left out of the charset API from 
earlier. So here's the API entry:

   INTVAL compare(STRING, STRING)
     Compares the two strings. Returns 1 if the left side is 
lexically greater, -1 if the right side is lexically greater, and 0 
if they're the same. Currently this is in the charset vtable, but 
that might change later to allow locale overrides. (It'll be hidden 
behind the string.c API at least, so that'll be transparent to 
bytecode)
--
				Dan

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Dan Sugalski                          even samurai
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