Virtual files are dumped to disk at each iteration in MPI processes, drastically reducing memory usage

Merge branch 'virtualize_output' of git.ia2.inaf.it:giacomo.mulas/np_tmcode into virtualize_output

move binary file output to virtual file passed via MPI to process 0, thread 0 for actual writing to disk

Draft: fix remounting files from threads and processes, fix pycompare accordingly

See merge request giacomo.mulas/np_tmcode!34

Prepare MAGMA

See merge request giacomo.mulas/np_tmcode!33

Added some indentation to make the ifdef nesting a bit less cryptic

put the preprocessor checks for logger entries of different matrix-inversion options in the correct order