[patch] Simplifying <algorithm>: Part 2

[Chris Jefferson]

Here is part 2 of the <algorithm> simplification, this time it's stl_algo.h

I've seperated this patch into 2 parts. Firstly there is the patch to 
stl_algo.h, which while large is hopefully not contraversal. Then there 
is a couple of small fixes to testsuite_iterators.h that have come up, 
and a big bunch of testcases for things I've changed in stl_algo.h These 
aren't (yet) very deep tests, just enough to act as a sanity check that 
algorithms are vaguely accepting and returning the right things.

Unfortunatly trying to read the patch to stl_algo.h is quite hard, as it 
seems to confuse diff quite badly.
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