Submission: updated std.uni module

[Thomas Kühne]

Attached is an updated std.uni module.

publicly visible changes:
1) updated casing and isUniAlpha data to Unicode 5.0.0

2) added "dchar[] toUniLower(dchar[])" and "dchar[] toUniUpper(dchar[])"
in order to handle cases like toUniUpper("\u00DF") -> "SS"


internal changes:
3) use AAs instead of hardcoded IFs for upper and lower casing
(I might expand the extractor to hardcode IFs, if anybody experiences
serious performance degration.)

Thomas
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