more usability functions

[Matthew Woehlke]

Olaf wants contrast(), which needs luma(). darken()/lighten() are wanted 
by Ion, either those or shade() (I think shade()) is needed for (1).

Anyway, here's the proposed API, attached.

1: http://permalink.gmane.org/gmane.comp.kde.devel.core/43099
(API proposal for that coming shortly...)

-- 
Matthew
So, an astrophysicist, a quantum physicist, and an astrologer walk into 
a bar...
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