Removed useless omp loop in the constructor, in order to be able to use push back on radfields vector and avoid dummy object contruction

Now solarAzimuth and solarElevation are passed as argument to terrain_radiation::getRadiation, so there is no need in Complex to store a pointer to radfields, so it is celaner. Note these two values are used only in complex

Fixed issue of MPI worker not be properyl killed. Howewer, some work is still required for a clean implementation

Adding output grids

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