continued fleshing out of the type conversion testing machinery.
continued fleshing out of the type conversion testing machinery.

This includes round trip testing of conversions through Object, string, and
unicode representations.  Several conversions were found that don't work.
These have been separated out from the majority which do work.  The failing
examples result in unit test failures.

numpy/numpy-refactor,numpy/numpy-refactor,numpy/numpy-refactor,numpy/numpy-refactor,numpy/numpy-refactor