Case-insensitive patch

[TNHarris <telliamed@...>]

This patch makes Lua symbols and table keys case-insensitive. Constant
tables and the string pool are kept case-sensitive. And a function is
exported to toggle the case-sensitive flag on select tables (but only
prior to inserting elements). I'm using two of the extra bits in
Table.flags: bit 7 is set when the table ignores case, bit 8 is set when
the table has not been modified. TString gets an extra unsigned int for
the folded hash.

It makes Lua, an already simple an unintimidating language, even simpler
and less intimidating for people who are used to using things such as
Basic. Because it's far easier to modify Lua than it is the end users.

Actually, I just wanted to see if it could be done and learn the
internals along the way.

-- tom
telliamed@whoopdedo.org

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