renamed CancelGcd -> XCancelGcd
renamed RingMacrosForGAPWithLibSing -> RingMacrosForGAPWithSingularForHomalg
renamed HomalgFieldOfRationalsInExternalLibSingular -> HomalgFieldOfRationalsInExternalSingularForHomalg
move around some code for cleanup
renamed CommonHomalgTableForLibSingular* -> CommonHomalgTableForLibSing*
moved SingularForHomalg.g? -> LibSingular.g?
renamed IsHomalgLibSingularRingRep -> IsHomalgLibSingRingRep

and TheTypeHomalgLibSingularRing -> TheTypeHomalgLibSingRing
typo
clean up comments
renamed LibSingular -> LibSing in Labels
renamed HomalgFieldOfRationalsInLibSingular -> HomalgFieldOfRationalsInLibSing

+ renamed HomalgRingOfIntegersInLibSingular -> HomalgRingOfIntegersInLibSing
fixed header comments