moved get_objgraph to scripts; added tests for detect, source, temp;
initial conversion of rest of main dill code and scripts to python3;
added dumpsIO and dumpsIO_source to dill.temp, also 'exec' bugfixes therein


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/dill@530 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/dill