og_mailinglist 6.x-1.0-beta1

Yeah! The first beta.

The biggest change since last time is #782360: Replace the current Drush system for handling incoming mail with a mimemail-inspired POSTing system which makes it much much easier to install OG Mailinglist as well as integrate with different MTAs.

After #782360: Replace the current Drush system for handling incoming mail with a mimemail-inspired POSTing system landed, Tobias got qmail integrated, #849608: Qmail support.

Other smaller bug fixes and feature additions:
* #903094: Pre-save the validation string, don't require people to save it
* #904022: Setting Max message body size to 0 results in error
* #905352: empty email address for posts sent by anonymous users
* #904136: unable to change email address for group
* #903446: two "error in sql syntax" errors in drupal log when posting new nodes via email
* #910812: feature to set default email settings for subscribers (mail, nomail, digest)