Multiple symmetry predictions

This is the version 0.7.6.6 (JUL 2022).

This version improves on the symmetry detection, specifically by:
a) Allowing for simple and fast symmetry detection using multiple average FSC value thresholds.
b) Resolving the polyhedral symmetries primer selection problem that has re-occured after the introduction of over-sampling in the last version.

Furthermore, this version improves upon the installation of ProSHADE on most platforms by better usage of compiler flags and other minor issues.