qutip/qutip — pull request #94 by cgranade (2014-03-28 16:35:38+00:00)
Title: Fix iscptp

In my earlier PR, I had forgotten to add a check for trace preservation in the ``iscptp`` property. This has now been added, along with test cases for the new ``istp`` and ``iscp`` properties. I'm not entirely satisfied with importing within the property bodies, but I'm not sure how else to avoid circular dependencies.