Appion

Two reason for removing this:
1. Xmipp wants to add h at the end of the symmetry string for using mirror to get projections and ended up with "c1 c1 c1h" in its input string and run as "c1" not "c1h", for example. This slows down the refinement.

2. Originally this feature is meant for relaxing symmetry constraint at later iteration. However, if higher symmetry is used at first, the Euler angles would be locked in the local minimal so it will need special perturbation not covered by our basic pipeline.