Links on Other URLs currently only allow alphanumeric chars and hyphens.

     release-notes = http://..
     support-forum = nntp://..

In the late FC/FM one could manually add random entries, and it allowed for spaces (e.g. "Fossil SCM" or "APT Repo").

The regex currently uses \s as delimiter for the Other URLs key=value CSV list. But maybe it could be adapted.
Otherwise output converted for display (`tr "-" " "`)

Wait for further usage examples.
(Reconsider if it makes sense for export formats [Atom mostly] to keep tag-name scheme.)