Support for "Mark as read" in user's mail filters

A few people on the internet have already requested support for the `imap4flags`. This pull request provides two things:

 - The templates for Sieve have been updated to include and load the `imap4flags` module. This is available also for Doctrine 1.1 and provides the ability to use the command `setflat "\\Seen";` which marks mails as read.
 - The web interface has been updated for a new action beside delete and more, named "Mark as read". This allows users to define mail filters which mark mails automatically as read. This currently only works for Sieve. Servers using Maildrop will silently ignore that specific user filter.

I would be happy to see that feature in ISPConfig 3.1!

See merge request !402

Enable the imap4flags module from Sieve to allow users to mark mails as read by using `setflag "\\Seen";`

If the user does not have the move to junk option enabled, mails should not be moved to junk! Therefore, only the further processing of mails should be stopped to prevent sending autoreplies to junk mails.

Hide DNSSEC from Wizard if DNS-Mirrors are available (prevents broken DNSSEC-Imp…

…lementaion on Multiserver-Setups)

See merge request !401

Hide DNSSEC from Wizard if DNS-Mirrors are available (prevents broken DNSSEC-Implementaion on Multiserver-Setups)

Fixed #4057 Remote API: some API calls are not working because the form definition files are missing

Hide DNSSEC from SOA if DNS-Mirrors are available (prevents broken DNSSEC-Implem…

…entaion on Multiserver-Setups)

See merge request !400

Hide DNSSEC from SOA if DNS-Mirrors are available (prevents broken DNSSEC-Implementaion on Multiserver-Setups)

Improved permission settings for the /var/run/hhvm directory. Run Tools > Resync to force an update of existing HHVM starter scripts to apply this fix if you currently use HHVM.

fixed #4062 - Several column don't sort at all (stable 3.1)



See merge request !399

add db-quota to reseller-limits (#4056)



See merge request !398

#4056



See merge request !397

Improved ispconfig.vhost for apache so that the sethandler directive does not affect other software which is accessed trough aliases.

Changed apache mod_proxy_fcgi configuration in vhost.conf.master from ProxyPassMatch to SetHandler so we can wrap the config directive it into <Directory ...> to avoid side affects with globally installed applications like phpmyadmin and roundcube.

Change cursor pointer behaviour (confusing) with readonly password fields

Same as !386 except for all passwords fields (some password fields have different ID's)

See merge request !396

Quirky behaviour when generating passwords (fixes #4065)



See merge request !395

Backup list fixes (responsive) (fixes #4066)



See merge request !394