DATACASS-131 - Prepare next development iteration.
DATACASS-134 - Added missing plugin repository declaration.
DATACASS-135 - Fixed reference documentation build.

Removed empty lang attributes from programlisting elements. Switched to Docbook 4.4 DTD as 4.5 is currently not supported by the Maven Docbook plugin. Fixed section identifiers.
DATACASS-137 - Completed
Added mapping for 3 new ConsistencyLevels.