For mapshed projects include a GMS file
for each scenario

* Named like scenario_this-is-a-scenario-name.gms
* List of mapshed data is passed from client; gms
  file is created on the server before adding to
  hydroshare

We were using the model package constants in
analyze, modeling and core/modals, but they
were declared in modeling. Move them to
core utils so they are available throughout
the client.