Inconsistent output filenames in the gridded initialization method

[nwagenbrenner]

Issue reported by Marc Buchs:

I noticed that the .asc output files from the gridded mass and momentum simulation also include further information in the file name. Between the name of the elevation file and the date it says "210_6" for example, whereas with my previous gridded simulations only using the conservation of mass solver it would only say the elevation file name, and then the date would follow. In the tutorial pdf, it says that this would be the input direction and then the input speed. Is it normal that output files from gridded simulations run with either the mass solver or mass and momentum solver differ like this?