Add tab-active function for search.php
Add search for Wikiportret (issue #8)

It currently searches in the filename. Clean up is needed, but I'll create a GitHub issue for that. Most of the code was copied from login.php, written by JurgenNL en sjoerddebruin.
Merge pull request #36 from Southparkfan/patch-7

Add search for Wikiportret (issue #8)