add sim_length param to JacobianGenerator
add sim_length param to JacobianGenerator

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