#276941: Remove mail / no mail options from group types : Move update patch to og_notifications; Add migration.

#157140 by moshe weitzman. major patch to let site admin specify which content types should act like a wiki (i.e. any group member may edit). See the new 'content types' fieldset on the admin/og/og page ... Requires a visit to update.php which will rebuild your node access table. I have a little code shuffling to do still so you might want to wait until next commit before trying this. Also implements #111836 which changed how we do node access grants.

#216812 by alex_b and moshe weitzman. move access control to a new og_access module. this feature isn not quite finished. please wait until my next commit and then help test this major change.

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

defer sending of notification emails until cron time. this speeds up posting for big groups with lots of email subscribers. the job_queue module is required for this feature. if not present, notifications are sent in real time (just like before this change).

remove 'website' as a field for groups. in order to get this back, add 'website' to your node type(s) that behave as groups. i left the website field in the og table. sites that want to preserve this data need to migrate it to their new field.

added an og_requirements() which gently warns if og access control is disabled and if job_queue.module is disabled.

#128306 group admin powers are now restored. a visit to update.php will rebuild node_access table. no schema changes. please report success or failure

#107289 don't deny access to nodes without any groups. patch by beginner and myself. there is an update required but the update does not change your schema. i do recommend backing up DB beforehand. Please report back any successes or failures with this new code.

#107441 use options instead of subs in audience array. was incorrectly hiding public checkbox. patch by bywnants. needs testing.