Unify DEP spelling with no space (e.g. "DEP0") instead of space or dash

Replace all occurrences of DEP-([0-9]{1,2}) and DEP ([0-9]{1,2}) with DEPN to ensure the spelling is consistent.

Do not change filenames, but allow them to stay as depN spelled with lowercase letters.

This is aligned with for example the spelling of package autodep8 and various files named dep3 or containing dep3 inside.

Note all three alternatives:

• !13 (merged): DEP-0
• !14 (closed): DEP 0
• !15 (closed): DEP0

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