[patch] : finish adding move symantics to <algorithm>

[chris jefferson]

This patch finishes adding move symantics to <algorithm>, in particular 
to the sort functions and inplace_merge, as they all use each other and 
the same internal functions.

This one is slightly more intrusive than the others, and in particular 
introduces different algorithms for sorting moveable and non-moveable types.

Bootstrapped on powerpc-apple-darwin8.1.0

Chris
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