[PATCH] devel/subversion repository target, fsfs support

[Roman Neuhauser]

The attached patch devel/subversion/Makefile adds a "repository" target
and support for fsfs repositories.

If you use the -DWITH_REPOSITORY_CREATION functionality of
devel/subversion but have been missing a possibility of having the
repository created at will as opposed at just the install time, look no
further. :)

I'm not submitting this as a PR yet because I can only test fsfs
repository creation with -DWITH_SVNSERVE_WRAPPER, so please, try it
out if you access subversion through apache/dav or some other funky way.

Also, I would be very thankful if someone who uses the wrapper with
a bdb repository could confirm that everything works with a repository
created with the patch applied (look for the usual commits stuck because
of wrong permissions on files or directories).

Changes:

- SVNFSTYPE variable affects the type of repository that gets created,
  defaults to "fsfs"
- the repository target allows for repository creation at any moment
- db/fs-type and db/uuid are excluded from chgrp/chmod like db/DB_CONFIG

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