Move namelist parameters to paramfile

[linniahawkins]

The PPE team would like to have several parameters that are currently set in the namelist moved to the parameter file:

Jmaxb1 (as a pft dimensioned value, per #2830) baseflow_scalar upplim_destruct_metamorph maximum_leaf_wetted_fraction interception_fraction pot_hmn_ign_counts_alpha decomp_depth_efolding

This is not 100% necessary for us to move forward, our scripting can handle namelist parameter modifications, but it would make things clean and simple.