Arvados

It's awkward and user-unfriendly to have to always copy and paste project UUIDs from the browser to the command line, for example when using arv-put --project-uuid zzzzz-zzzzz-zzzzzzzzzz

It should be possible to supply a project path on the command line, for example arv-put --project "/home/My example project" This should also support integration with arv-mount, for example arv-put --project "~/keep/home/My example project" would look for the .arvados#project magic file and do the right thing.

There are two subtasks:

a) Add a function to the Python (+Ruby?) SDK that performs dereferencing
b) Audit and update arv-* tools to accept paths where currently only uuids are accepted.