Resolve LEI-40

Closes LEI-40

See merge request !90

Monitoring maintenance Epic branch merge

See merge request !89

SW-822: Commit unstashable / unresetable file changes after fresh clone, probably due to .gitattributes / line endings

Resolve SW-835

Closes SW-835

See merge request !88

SW-000: use wildcards to prevent git from adding each individual path resulting in many annoying merge conflicts

SW-835: reverted back to commit d63f5d4c. The weird casting was ok after all, but it needs the proper DAL version >= 3.3.1

SW-835: made a copy of Docker/lofar-outputproc and used it as a basis for Docker/lofar-subbandtbbwriter, which is not to be confused with Docker/lofar-tbbwriter which is maintained by Sander/Nijmegen