usage corrections and porting to python2.6

[aravindhramu]

Usage correction in copy_collection.py and changes to port hydra to python2.6

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}