Merge branch 'cleanup-4' into 'master'
Remove more no longer used code This merge request removes: - the C++ frontend for DDD, - several unused functions from PPIF, - the `tools` directory which provided tools to visualize UG's metagrid format and to convert different grid formats, - some parts of `np/algebra`, - most remaining bits of `dev/*`, and - `ui/fieldio.*` which was already unused. See merge request !16
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