alpine3d

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.