initial checkin of iterator_adaptors, same as original wrapped_iterator
except for changing the name to iterator_adaptor


[SVN r7644]
changed the order of the template params in iterator_adaptor so that
traits comes before non-const iterator because it may not have a default
in the case of VC++


[SVN r7645]
added iterator_adaptors type generator, added copyright for jsiek


[SVN r7649]
generic tests for standard conforming iterators


[SVN r7650]
added transform_iterator, indirect_iterator, reverse_iterator, integer_range


[SVN r7652]
fixed g++ operator ambiguity problem bu adding iterator_comparisons class


[SVN r7653]
Simplified things a little by removing an unused template parameter from
iterator_comparisons<>. Conditionalized the use of iterator_comparisons<> on
BOOST_RELOPS_AMBIGUITY_BUG.


[SVN r7666]
Some fixes for MSVC6, plus changed instances of BOOST_NO_ITERATOR_TRAITS to
BOOST_NO_STD_ITERATOR_TRAITS.


[SVN r7669]