* SkipList was incorrectly calling a method from the shadow api.
* Bug fix on relation iteration.

* Indexed relations with multiple values per key were incorrectly iterated when a 'sub-collection' (i.e., multiple elements for the same key) existed at some point in time but then were all deleted. This leaves a tomb sub-collection that was not being skipped in the iteration.
* SkipList iteration was incorrectly detecting the finish condition.
* Had forgotten to remove the DML part of the deprecated indexes.
* Temporarily changing the timeout of Arjuna for debug.
* Minor changes.
* Added a module to test Collections. Ongoing work.