#164070 use editors subscriptions in the audience form element instead of node author's. closes a major TODO. please test. patch by moshe weitzman.

add hook_node_access_explain() which helps admins and developers understand the grants on each node. all developers of node access modules are encouraged to implement this hook. see devel_node_accesss.module in devel package.

#186533 properly set group context for comment edit and reply pages. initial patch by sdelbosc. also admin help tweaks.

remove long deprecated submission guidelines preference from admin page. use content type equivalent instead.

#182936 Make it possible to add tabs to the group home via Views (and only the group home page). patch by KarenS.

Public checkbox makes no sense if access control is disabled. Also add hook_requirements() check so admin creates his node type and assigns as group type.