add automated choice of which posterior to use for species list

[AdityaSavara]

species_list =['a','b','c']
species_kinetic_role =['reactant', 'intermediate', 'product']
kinetic_experiment_type = 'transient'
This example would use concentration, rate, concentration for the posterior.
If it is steady state, then it would be concentration for all of them.
For transient, need the uncertainties of initial concentrations for each of them.

[AdityaSavara]

This is now in the code, but the way I made it was like this:

UserInput.model['kinetics_type'] = 'transient'
UserInput.responses['response_types']=['P'] 
UserInput.responses['response_data_type']=['r']

This feature still needs to be documented so others can use it.