radio-astro-tools/spectral-cube — pull request #127 by keflavich (2014-08-22 14:14:21+00:00)
Title: Add 'copy' tools to masks

Masks should be copyable, right? This provides for copying. Let me know if it's a waste of space - maybe `copy.copy` does this all right?

cc @astrofrog, @chrisbeaumont