Renamed a local variable in DBEditSet.rollback().

Changed obj reference to eObj reference, to underline that it is
a DBEditObject reference.
Qualification tweaks and localization defaults.
Essentially revert the change to DBNameSpace.java in commit 6c86ce7613b0af44c8c19dd664dd18fef7c021b4

The DBNameSpaceHandle copying I was doing with the DBNameSpaceHandle copy
constructor was losing the subclass information for DBNameSpaceEditingHandle
instances, thus breaking checkpoint rollbacks in the middle of a transaction.
Fixed a bug I introduced in DBNameSpaceHandle copying.