refactored and commented pore_transport macro
refactored and commented pore_transport macro

d-fan/pysb,spgarbet/pysb,johnbachman/pysb,alubbock/pysb-legacy,d-fan/pysb,alubbock/pysb-legacy,alubbock/pysb-legacy,LoLab-VU/pysb,jmuhlich/pysb,spgarbet/pysb,LoLab-VU/pysb,johnbachman/pysb,neurord/pysb,d-fan/pysb,neurord/pysb,spgarbet/pysb,neurord/pysb,alubbock/pysb,alubbock/pysb-legacy,pysb/pysb