Generate a list of class 'mbal_gas' with estimates for the unknown parameters of a volumetric gas reservoir
# S3 method for volumetric_optim_gas
mbal_optim_gas(optim_lst, time_lst)
a list object of class 'optimization_gas'
a list object of class 'time'
a list of class 'mbal_gas' with estimates for the unknown parameters of a volumetric gas reservoir