There is no reason to not use require_once everytime

This way if an included file is missing, the page will crap out and
there won't be an unintended behavior
Merge remote-tracking branch 'origin/master' into require_once_ftw

Conflicts:
	add.php
	bbs.php
	error.php
	groups.php
	lists.php
	oneliner.php
	party.php
	preview.php
	prodlist.php
	search.php
	topic.php
	userlist.php
Do not require_once the menu we display
Merge branch 'master' into require_once_ftw
Merge pull request #5 from pouetnet/require_once_ftw

There is no reason to not use require_once everytime