The model will now be tested, if I'm lucky, everything works as it should.
Landuse will not be interpolated between time step because:
1. seasonal changes are instant, so keeping track of snowmelt on a higher
	frequency than input data is read (hourly?) makes little sense.
2. Other parameters are interpolated instead, such as U*, vd etc.
	(how true/effective is this?)

Also indented block to follow FLEXPART coding standard (didn't touch any other
part of the file, so these are still indented wrong).

A clean copy of the latest BETA version from http://flexpart.eu/wiki/FpLimitedareaWrf