have most of pt2to3 fleashed outh
some innocuous Cython v0.19 updates.
some fixes to previous_api()
many updates.
moved names to past
past'd file.py
updated hdf5 extension
made it through indexes
updated link extension
moved lru cache
added node.py
made it to table
added stuff
finished table.py
moved table extension
made it though utils
all converted.
fixed up 2to3 to run
minor setup update
ran pt2to3 on tables/ and did some cleanup, tests pass