Make the debug log more specific

See merge request ispconfig/ispconfig3!847

Add README to indicate where to override these templates

See merge request ispconfig/ispconfig3!848

Limit rounding quota to 1 decimal

See merge request !846

104.3 MB looks better to me then the current 104.3345 MB. (is that level of detail is desired then maybe we should force kB notation.)

Maybe 2 or even three decimals ... but not 4.

Add domains domain update API function

See merge request ispconfig/ispconfig3!845

#5189 Warn if the lockfile for system cron is older than a day

See merge request ispconfig/ispconfig3!843

We want to avoid deadlock situations and right now if there is a process
running with the same PID that is not our process (e.g. after a reboot)
we might be waiting forever to run the cron again. So to make this
transparent to the user, we at least post a warning into the logfile.

DNSSEC support for PowerDNS

See merge request ispconfig/ispconfig3!839

fix getDatabaseSize()

See merge request ispconfig/ispconfig3!829