#230501. Add hook_og_link_alter() where modules can fiddle with links in the og details block. Also add a link back to group homepage in block title.

#229037 by gustav. Change text from subscribe/subscriber to join/member. Please update your email templates and translations.

New module: OG Panels. Allows group admins to create as many custom panel pages as they want and one of them can be designated as the group homepage. Groups become vastly prettier and easier to organize their contents. Requires Panels version 2. Sponsored by the Post Carbon Institute.

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.

#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.

noted requirement to re-save group nodes after designating a type as a group. patrch by bonobo. modified for 5.0 by me.