Update History tests to enable testing all Horde_Db drivers.
Merge branch 'master' into history
Add support for a modification sequence to Horde_History
Test for modification sequence functionality
This should be protected.
Actually return the result.
Update test
Catch Horde_Db exceptions.
Add to the base class (make abstract in H6).
Update test
Add modseq version of getActionTimestamp method.

Returns the modseq of the most recently performed action on requested guid.
Add test for getActionModSeq()
Add Horde_History::getByModSeq()
Add test.
CHANGES