Merging predicated and non-predicated algorithms

[caj]

Here's attempt 2 of mergin the predicated and non-predicated algorithms.

This adds a new header called predefined_ops.h, which contains the 2 
current predefined operators. The only thing I've done (other than take 
all the advice given last time, thank you!) is push them into their own 
namespace, __ops, as I was nervous about the number of things called 
less and __less around the place.

This patch changes equal, mismatch and lexicographical_compare in 
stl_algobase.h and also provides tests for all 3 of them.

Chris
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