[PATCH] bug(let) in mod_dav_svn: Cannot navigate from repository top to repository list when SVNListParentPath is on.

(trying again)
Reproduction recipe.

  - Go with your browser (IE or any other) to the top of any svn repository
  where SVNListParentPath is set to on, e.g.:
        <http://svn.webwideconsulting.com/plugins/friendship_plugin/>
  - Note that the super-directory (/plugins/) is browsable as well, but
  you cannot navigate to it from here.
  - I would expect that the first entry of the list is a hyperlinked "..",
  which would navigate to its super-directory.

  I checked this with the Collabnet win32 build of SVN 1.5.0-beta1,
  and the buglet is still there.

  Rationale: in repos.c, the decision whether to include the link or not
  is based on
  two things:
  - If repos_path is of length 1 (so it must be "/"), then skip this step
  - If the collection is of type DAV_SVN_RESTYPE_PARENTPATH_COLLECTION
    (the highest browsable directory), then skip this step too.

  This can be fixed by ignoring the first condition when
SVNListParentPath is on.
  Unfortunately I don't have an environment set up to build mod_dav_svn to test
  this, but I'm pretty confident that this fix will work (for what's worth).

  Can I file an issue for this? See patch below.

  Regards,
         Jan Nijtmans

  Here is the patch against svn-1.5.0-beta1 (I re-ordered it a little because
  dav_svn__get_list_parentpath_flag() is a more expensive test, so it should
  be done last):

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