* Install PHP7 via a PPA, enable unattended upgrades for the PPA, and switch all of our PHP configuration to the PHP7 install.
* Keep installing PHP5 for ownCloud/Nextcloud packages because we need it to possibly run transitional updates to ownCloud/Nextcloud versions less than 12. But replace PHP5 packages with PHP7 packages elsewhere.
* Update to Nextcloud 12 which requires PHP7, with a transitional upgrade to Nextcloud 11.0.3.
* Disable TLS cert validation by Roundcube when connecting to localhost IMAP and SMTP. Validation became the default in PHP7 but we don't necessarily have a (non-self-)signed certificate and it definitely isn't valid for the IP address 127.0.0.1.

Merges #1140

Switched to the -complete download which has vendored assets. See https://github.com/mail-in-a-box/mailinabox/pull/1140.

download jQuery and Bootstrap during setup and serve locally so that we don't rely on a CDN which is blocked in some parts of the world (#1167) (#1171)

Updated the setup file to use roundcube's 'larry' theme as the default.

Corrected typo in setup/dns.sh

They are known to cause troubles, for more information see
https://github.com/nextcloud/server/issues/3847

closes #1134

branch 'nextcloud' of https://github.com/yeah/mailinabox

e.g. code comments and user-facing prompts/outputs which can be safely changed without risking to break anything

Since it says "RCMCardDAV requires at least PHP 5.6.18. Older versions might work", let's hope for the best.

Also hiding its preferences panel in settings since if it doesn't work, we don't want folks using it for anything but connecting to ownCloud contacts.

To comply with #1098 and avoid failed setups while testing with Vagrant

* Move variable assignment up and do not use call arguments directly

* Upgrade ownCloud to latest patch release 9.1.4

also move owncloud hash to its own variable

Added an alternative mail log scanning script for use from the command line (and monitoring, at a later stage)

merges #970