Draft: provide access to optimization functions

Open Kevin Kuns requested to merge kevin.kuns/pygwinc:access_optimization into master
  • renamed squeeze.py to lib. with the purpose of housing more general functions
  • added a function optimize_PRM_transmissivity which exposes the PRM transmissivity optimization provided by ifo_power
  • changes computeFCParams so that the optimal parameters are returned instead of directly modifying the ifo struct

This relies on the ifo_power function which is undergoing changes in !138

closes #73

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