Testsuite additions

[Chris Jefferson]

I enclose 4 files. Firstly the major file, testsuite_wrappers.h , is an 
attempt to produce a wrapper which takes an array of some type and 
produces a forward, bidirectional or random_access iterator based upon 
the input type. I have attempted to have these exactly satisfy the 
requirements of the c++ standard, but it wouldn't suprise me if I've 
slightly slipped up somewhere.

To demonstrate these, I enclose tests for 3 functions in <algorithm>, 
which attempt to test coverage of the library functions.

It should be noted that these all pass, however the reason I submit 
these 3 is because in the near future I intend to try submitting patches 
to these which improve performance (and in the case of std::reverse, 
perhaps standards compliance).

Do these seem reasonable to people at first glance? I would quite like, 
and don't think it would hurt to have, a set of similar tests for 
complience of the various algorithms, so intend to continue writing 
similar things, through which hopefully any bugs in testsuite_wrappers 
will get shaken out.

Chris
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