added indexes on the virtual alias tables

When you're hosting a couple of hundred aliases, you will benefit.
It seems safer to create the index and deal with the slight overhead
for just a couple of records, as opposed to not having these
indexes and deal with serious performance issues if you have
lots of aliases on the machine.
Merge pull request #124 from markpasc/no-fail2ban-mail

Don't individually mail all fail2ban actions
Merge pull request #127 from tilsammans/indexes

add indexes on the virtual alias tables
Set up calendar server
Get the config file owners & permissions right