add setHideLabel for KwfFormContainerAbstract

because KwcFormDecoraterLabel sets for all kwfFormFields a label
added field priority for KwcArticles to sort articles after priority
field priority for KwcArticlesDetail is now required
the untagged warning is now optional and settable in the config
Fixes #22
bugfix for FormFields to allow trlKwfStatic for helpText
added helpText for priority field in KwcArticlesDetail
Merge branch 'opttag' of git://github.com/yacon/koala-framework into yacon-opttag

Conflicts:
	Kwf/Controller/Action/User/LoginController.php
Merge branch 'yacon-opttag' into 3.2