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

The `default_vsz_limit` is the maximum amount of virtual memory that can be allocated. It should be set *reasonably high* to avoid allocation issues with larger mailboxes. We're setting it to 1/3 of the total available memory (physical mem + swap) to be sure.

See here for discussion:
- https://www.dovecot.org/list/dovecot/2012-August/137569.html
- https://www.dovecot.org/list/dovecot/2011-December/132455.html

SSH fail2ban jail is not enabled by default and so the jail does not load.