Test to do for the spatio-temporal model

[JavierDiezSierra]

• [x] Check the storm_radius option.
• [x] Check if the the model works with hourly data.
• [x] Check the "utm" option.
• [x] Check if process="storms" works
• [x] Create a function to multi-site rainfall disaggretion.

[JavierDiezSierra]

Check why the storm_radius option loss water for some set of parameters