moved _namespace, likely_import, _likely_import from pox to dill.source;
moved _import from klepto.archives to dill.source.getimportable


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/pox@592 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/pox