add old builtin coordinate systems as vali transform targets
added more transform tricks to make old system names work
Fix for transformations failing if there is a system that can be transformed to but not frow
minor docstring correction
locals->globals for py 3.x

A subtle change is made in py 3.x such that the locals() dictionary
inside a list comprehension is onloy local to the list comprehension
Merge pull request #1700 from eteq/fix-coordinate-transforms-old

Fix coordinate transforms to old names