provision 6.x-0.4-alpha1

Provision is a component of the Aegir hosting system.

This is the first release of the 0.4 milestone. The provision backend has seen a few bugfixes but mostly the beginning of exciting new features.

New features:

* site clone support #448692: site clone support
* SSL support (no certificate management yet) #537004: "SSL site" option
* arbitrary port support #515052: Customizable port field per site
* arbitrary vhost configuration support (vhost create, vhost delete drush commands)
* domain redirection in the backend #535098: domain redirection

Bugfixes:
* #524916: User not defined on new platform again?
* check drushrc.php exists on platform before trying to make it writable #565012: Provision tries to change permissions on drushrc.php before generating it

API change: virtual hosts files are now created with the port in the file name so that different vhosts on different can be generated without conflicts.