add a localization test to model_mod_check

[nancycollins]

Use case

in a new model_mod, if there is code in the get_close() routines to modify the localization, it needs testing. the current model_mod_check does not call get_close to test localization. also if someone modifies the model_mod::get_close routines, this would allow for testing of new/changed code

Is your feature request related to a problem?

bugs in model-specific get_close routines are common. having a simple way to test them with model_mod_check would be very useful.

Describe your preferred solution

Add a localization test to model_mod_check. it's possible this may require a new routine in each of the location-dependent modules in model/model_mod_tools

[hkershaw-brown]

linked #294 #379