Huge refactoring to remove dependency on BDB XML. Report data is now stored in the Trac database (SQLite/PostgreSQL). Also: * Fix reporting of lines of code for modules that have partial coverage. * Get coverage results also in case of test failures. * Improve database upgrade procedure (will now give feedback). * Introduce report categories to allow the output of other tools (JUnit, Clover, etc) to be visualized by the same components in the server-side without modification.