Implemented sha256 to recognize duplicate papers.  Haven't tested the
transfer duplicate check but it should work using the __eq__ function.
I have tested the add duplicate check.

I changed the paper class to have a proper name (Paper).

Improved the output on the search module.

Better support of system names vs user names for Paper attributes
House keeping!
	New version
	Fix repo to support change from 1.1 repo to 1.2 repo
	New 1.2 repos include sha256
	Duplicate detection based on sha256 in add module and transfer
	Added some more comments throughout