https://bugs.eclipse.org/bugs/show_bug.cgi?id=394076
- upgraded to CDO 4.x fixing depreciations 
- set signal timeout as a session option. (Not config). 
- Remove package registration when opening a session. (This is done
automatically).
- updating comments.
- Differentiate between commit and commitThenClose in IDataProvider
- Fix problem with splitting values in week for aggregation.