Rewrote Member section to $this->render() format

Also:
* removed "Detail páru" (for further consideration...)
* added orderByCount option to DBSkupiny::getSkupiny()
* fixed reversed By/For in PartnerRequestHelper
* fixed self/$this mixup in RedirectHelper
* added User::getGroupName()
* added cookie_set/cookie_reset in sitewide "off-mode"

Signed-off-by: dradancer <kuba.zarybnicky@post.cz>