Revert to <verbatim> InterWikiMap. (Re-)Fix the Category: prefix

Revert to <verbatim> InterWikiMap.  (Re-)Fix the Category: prefix
bug.

The idea is to have it cut-and-pastable and diff-able from the
regular UseMod format map files.

If we really want an annotated InterWikiMap, we should think out a
better format than just a <pre> block.  (Perhaps based on definition
lists, or definition list tables.)  Also note that many of the "URLs"
in the map, are invalid by themselves, so linking them all as is
is not a great idea.

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@1909 96ab9672-09ca-45d6-a79d-3d69d39ca109