Implement version parsing.
Implement directory remove.

Only removes link to subdirectory. No files are removed.

Note that if the subdirectory is re-added and then the config is
re-written WITHOUT being read again then the added subdirectory file
will be rewritten with blank (or edited) details that were in memory at
the time.
Minimal tests of verion parsing
Wrap directory removal
fix and error improvement
more commands