Add defaulting capabilities as to which modules you want to allow.  If they're globally disabled, you can't use it as a default.  If they're globally enabled, you can then choose if you want to use it as a default module for newly registered and imported hosts.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@2183 71f96598-fa45-0410-b640-bcd6f8691b32
Merge svn with master