Revert "Small changes for valid HTML."

We use HTML5 now, so XHTML nonsense shouldn't be used anymore.

This reverts commit b3f7a9df506b9580d096e9e63f1924619157363c.

Conflicts:
	ajaxcallbacks.php
	index.php
	install/doinstall.php
	layouts/nsmbhd.php
	lib/links.php
	lib/mysql.php
	lib/post.php
	pages/editfora.php
	pages/fixpostrevs.php
	pages/posttest.php
	pages/profile.php
	plugins/blogxd/page_blog.php
	plugins/goomba/footer.php
	plugins/layoutblockstats/profileTable.php
Merge branch 'master' of https://github.com/Dirbaio/ABXD