Remove deepcopy of phase_info from the level 2 interface.

[Kenneth-T-Moore]

Summary

Removed the deepcopy of phase_info from the level 2 interface to prevent the potential problems when copying local attributes that aren't copyable.

• Update several tests to do a local deepcopy of phase_info so that the aviary default versions aren't modified during testing.

Related Issues

• Resolves Deepcopy of phase_info in AviaryProblem can cause problems. #40

Backwards incompatibilities

None

New Dependencies

None

[johnjasa]

Thanks for this, Ken!

[Kenneth-T-Moore]

I made some changes to remove all of the intentional changes that level 2 makes to the phase_info object (essentially removed all the dictionary pops.)