This adds the parameter extraction code from the xhtml renderer to the
metadata renderer in order to not to include the parameters in the id
that is recorded as link target. A test case checks that the link is
actually returned as backlink (fails without the fix).

This does not fix FS#2677, it only adds support for fixing it later.

This time the test case was correct and actually showed a bug in the tar
library. The error occured only on the first build (directory build/0/)
where the zero was stripped from the path name.

I added unit tests to the cleanPath function and discovered another bug
with handling relative directories. I rewrote the cleanPath() function
and now it should finally work.

Unit tests FTW!

also allow the order to be specified in more places.

Currently the search box is below the media file list, where it is
effectively inaccessible in a namespace with lots of files.  This
change moves the search box above the media file list and below the
upload form.

This is another go at what pull request #227 tried to do. This removes
support for a style.local.ini in the template file in preference of a
style.ini in the conf folder