Table.indexOf(TableItem item) implemented.
Removed depreccated classes from workbench. Fixes #603
Set dependencies of other RedDeer bundles to [0.6,0.7)

As requested in #608, all dependencies to other RedDeer bundles
are now restricted to [0.6,0.7) so that versions don't get mixed up.
Direct plugin refactored to common, classes deprecated (fixes #610)
Database requirement initial implementation (fixes #163)
Added missing javadoc for methods (fixes #614)