itzi should fail early when overwriting STDS with different temporal type

[lrntct]

When overwriting a STDS with a different temporal type, the simulation fails when it tries to register:

#!sh

Gathering map information...
ERROR: Unable to update raster map <Mexico_Hondon_wse_0000@MexicoDF>. The
temporal types are different.
Traceback (most recent call last):
  File "/home/jrodriguezri/.local/bin/itzi", line 11, in <module>
    sys.exit(main())
  File "/home/jrodriguezri/.local/lib/python2.7/site-packages/itzi/itzi.py", line 53, in main
    args.func(args)
  File "/home/jrodriguezri/.local/lib/python2.7/site-packages/itzi/itzi.py", line 94, in itzi_run
    sim.run()
  File "/home/jrodriguezri/.local/lib/python2.7/site-packages/itzi/simulation.py", line 145, in run
    self.report.end(self.sim_time)
  File "/home/jrodriguezri/.local/lib/python2.7/site-packages/itzi/simulation.py", line 234, in end
    self.register_results_in_gis()
  File "/home/jrodriguezri/.local/lib/python2.7/site-packages/itzi/simulation.py", line 304, in register_results_in_gis
    self.temporal_type)
  File "/home/jrodriguezri/.local/lib/python2.7/site-packages/itzi/gis.py", line 348, in register_maps_in_strds
    unit=r_unit)
  File "/usr/lib/grass70/etc/python/grass/temporal/register.py", line 497, in register_map_object_list
    file=filename, dbif=dbif)
  File "/usr/lib/grass70/etc/python/grass/temporal/register.py", line 279, in register_maps_in_space_time_dataset
    'id': map.get_map_id()})
  File "/usr/lib/grass70/etc/python/grass/pygrass/messages/__init__.py", line 269, in fatal
    raise FatalError(message)
grass.exceptions.FatalError: Unable to update raster map <Mexico_Hondon_wse_0000@MexicoDF>. The temporal types are different.

itzi should check the temporal type at the beginning of the simulation to fail early and prevent unpleasant surprise at the end.

[lrntct]

This seems to be a GRASS issue. My best bet would be a check at the beginning of the simulation, to avoid receiving an error message at the very end.