Params from and pt_alpha

[Lauren-Somers]

I think there is an error in how pt_alpha is assigned in printPRMSparamfile.py . A basic pt_alpha value is assigned for the whole array. The number of entries = nhru*nmonths. This part is fine. There are the correct number of values so no error is raised. However when assigning different values of pt_alpha for high elev barren, it's only done for the first month (Jan) so the rest of the values remain as the default.

[awickert]

I don't know much about this -- @gcng do you know?