provision 6.x-0.4-alpha2

Provision is a component of the Aegir hosting system.

This is the second release of the 0.4 milestone. Many bug fixes have gone into Provision since alpha1, plus many new features to the Aegir project as a whole.

Bug Fixes:

* fix sending of blank e-mails, regressive issue from d5 backport maybe #580264: Blank welcome e-mails being sent to client e-mail on provision of sites
* restore the vhost conf on rollback of migrate #585810: migrate rollback fails to restore vhost
* make mysqldump file non-readable by webserver while executing backup #590506: backup creates world-readable backup of the database in sites/foo.example.com
* properly set the $client_email variable so the mail field isn't populated with the site_url #596694: new sites fill user 1's email field with url instead of email address