Deleted unused private static method.
Removed unused imports.
Refactoring : extract common methods.
Re-added the getter for the BonitaSynchronizations.
Fixed spelling mistakes.
Cosmetic : updated javadoc.
Refactoring : reuse existing method to known if the transaction is active or not.
Added some hooks in order to be able to subclass ProcessAPIImpl.
Allow access to the logger for the subclasses.