finished existing test cases for file pickling; added new TODO cases


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/dill@694 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/dill
added test cases for pickling file when file has grown


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/dill@695 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/dill
Merge branch 'master' of https://github.com/uqfoundation/dill into memorise
Further optimisations and enhancements for memorise