[patch] : RFC - expanding the testsuite to try multiple iterator categories

[Chris Jefferson]

Apologises for the continuing postings of not-entirely complete patches, 
I'm just trying to gather opinions on another change.

This one is entirely testsuite based, so shouldn't make any real 
difference. It changes tests so that they are run on all possible 
iterator types a class accepts, rather than just the simplest one it 
takes (so that all specialisations will be tested).

Unfortunatly I've been unable to make it look as nice as I'd like, and 
it involves wrapping templated tests in a class so that they can be 
passed around. If people vote that this just looks too messy / 
complicated, then I'll just have eash testcase have 3 or 4 almost 
identical blocks which test the various types of iterators...

If I don't hear any specific complaints against this, I'll assume that 
no-one has a great problem with it, and I'll start adding them to other 
tests (my long-term aim is to get to the point where I can call gcov 
over the testsuite and get total coverage of the <algorithm> header.
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