Update MX records using DNS Update API / Management UI

Give the DNS update tool the ability to customize MX records. Useful if you want a subdomain to send mail to another host.

Changed MX check to respect priorities other than 10.

The status check on MX records now correctly handles domains with
multiple MX records.

Reordered the if a little, added some string parsing, and modified the
OK text to include a warning.

Do not show '_secondary_nameserver' in Custom DNS table

It's redundant and potentially confusing, as any secondary NS shows in "Using a
Secondary Nameserver".

when serving a 'www.' domain, check if the parent domain's ssl certificate can be used besides checking PRIMARY_HOSTNAME

Removing buy_certificate.py which is not working and I don't want to update its call signatures.

all mail domains, not just (top-level) zones, must have an entry in the opendkim key tables so that such outgoing mail gets signed

If you had both x.y.com and y.com configured here, x.y.com mail would not get DKIM-signed.

if a domain has a catch-all or domain alias then we no longer force the creation of postmaster@ and so we should not be checking for its existence in the status checks

see 85a40da8

status checks: if a service isn't available publicly, check if it is available on the loopback interface to distinguish not running from not accessible

Add additional options to really prevent apt from asking questions, which causes setup to hang because stdin/out have been redirected.

fixes #270, #291

fixes #308

cc333b39 worked for fresh systems, but if the system already had the daemon running the api.key file would already exist and the test would pass to early. Now removing the file first.

fixes #322

typo in "roudcube"

Disable viewing dotfiles (.htaccess, .svn, .git, etc.)

web admin: simplify the instructions for creating a separate web directory for particular sites by moving it into a modal

if the user has set a http proxy or redirect on the root path of a domain, using custom.yaml, skip the domain from the static hosting panel because it wont be serving any static files

if a custom A record is set, dont put in a default AAAA record pointing to the box because it will probably be wrong --- the user should either set an AAAA record or let the domain not resolve on IPv6

I squashed some commits together and modified the commit message...

removed hardcoded /home directory to apply the existing configuration options for STORAGE_USER/ROOT if they exist

Highest priority: the pre set STORAGE_ROOT/USER, midmost priority: the config settings, lowest priority: the default one.

fixes #309; closes #311

closes #313

hide nginx version an OS information for better privacy

do better redirection from http to https

Redirect using the 'return' directive and the built-in
variable '$request_uri' to avoid any capturing, matching
or evaluation of regular expressions.

It's best practice. See: http://wiki.nginx.org/Pitfalls#Taxing_Rewrites