Added local Joomla integration rather than relying on Joomla having the separate plugin installed. (But still support the plugin if it's there, as it gives a lot more flexibility)

Applies to Q2A ‘internal’ users (already exists for external users).
External user version updated to handle flags.

Fixes #350.

Filtered due to lack of support in MySQL < 5.5.3.

10x faster with many blocked IPs

Remove code duplication.
Close #273.

Replace old hcard microformat