integrate coarse sol. lg-prolongation into identify_fine_scale_part

and get rid of coarse_scale_part
adds weight for lg-prolongation + makes overlay cut optional
fine Grid/Space is no longer used in msfem solver
fixes runtime errors
whitespace
enable two-stage creation of coarse/fine grids
format
fixes test compile
removes a few obsolete files
fine grid is only created for cg-fem sim if/when needed