fix problem with certificate verification on OpenVZ servers

bidirectional alias controls: a new permitted_senders column in the aliases table allows setting who can send as an address independently of where the address forwards to

But the default permitted senders are the same as the addresses the alias forwards to.

Merge branch 'dhpiggott-bidirectional-alias-controls'

Contacts and Calendar are now versioned separately from ownCloud core.

Contacts appears to be in a v0.4.x.x series. This is the hash of v0.4.0.0.

Per https://github.com/owncloud/calendar/issues/892, Calendar is in a 0.7.x series. This is the hash for 0.7.2.

Only core. The apps don't seem to have been updated.

S3 backups fail if no prefix is used

Merges branch 'ponychicken-backup'.

* going from s3 to file target wasn't working
* use 'local' in the config instead of a file: url, for the local target, so it is not path-specific
* break out the S3 fields since users can't be expected to know how to form a URL
* use boto to generate a list of S3 hosts
* use boto to validate that the user input for s3 is valid
* fix lots of html errors in the backup admin

Also clarify a comment and remove an unneeded type check

Backup location and maximum age can now be configured in the admin panel.
For now only S3 is supported, but adding other duplicity supported backends should be straightforward.

see https://discourse.mailinabox.email/t/bug-present-for-ages/694/3

Some users report munin is broken because munin and munin-node disagree about the name of the machine. I think this occurs if hostname (used by munin-node) reports a different name than PRIMARY_HOSTNAME (which we put in the munin config).

Hard-code PRIMARY_HOSTNAME in munin-node.conf.

Fixes #474.
See https://discourse.mailinabox.email/t/404-not-found-on-admin-munin/623/24.

dont run network checks during upgrades since this is a bad reason to block an upgrade from going through

This makes the frontend consistent with the backend.