Removed old view factor writing code. Moved view factor writing to Ebalance constructor and added a pure virtual view factor getter in TerrainRadiationAlgorithm

Added the possibility to write some more dem grids with the key WRITE_DEM_DETAILS = true in [output]

Removed grids unnecessary filled in snowpackInterfaceWorker. Now there is a static vector in SnowpackInterface, grids_not_computed_in_worker, which tells which grids should ne be filled in the workers. So in order to get output for these grids a proper case should be added in teh switch in SnowpackInterface::getGrid. For grids which are not ignored, i.e. which have to be filled in the workers, a proper case should be added in the switch in SnowpackInterfaceWorker::fillGrids.

Added clean output for view factor grids, now the key: WRITE_SKY_VIEW_FACTOR = true has to be specified in the ini

Added new output grids in radiation. ILWR_terrain now just writes ILWR, terrain LW not yet taken into account

Added output interface for terrain SW and LW and view factor, not yet getting data from Ebalance module