rename import_PropPreservingPartition -> ppp2spec
rename import_PropPreservingPartition -> ppp2spec

rename variable self -> spec
update arguments in docstring

tulip-control/tulip-control,tulip-control/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control