Added 18 analysis functions, 5 helper functions

Analysis Functions:
zGetPSFCrossSec(),
zModifyFFTPSFSettings()
zSetFFTPSFCrossSecSettings(),
zSetHuygensPSFCrossSecSettings(),
zModifyHuygensPSFCrossSecSettings(),
zGetPSF(),
zSetFFTPSFSettings(),
zModifyFFTPSFSettings(),
zSetHuygensPSFSettings(),
zModifyHuygensPSFSettings(),
zGetMTF(),
zSetFFTMTFSettings(),
zModifyFFTMTFSettings(),
zSetHuygensMTFSettings(),
zModifyHuygensMTFSettings(),
zGetImageSimulation(),
zSetImageSimulationSettings(),
zModifyImageSimulationSettings(),

Other functions added:
zGetNumField(), zGetNumSurf(), zGetNumWave(), zGetImageSpaceNA(),
zGetIndexPrimWave(),

Function name changes:
zCalculateHiatus() to zGetHiatus()
more fixes for os independence
merge in v0.8.0