Task #10811: intermediate commit for method get_conflicting_overlapping_claims. Needs to be fixed, but you get the idea.

Task #10811: made functions (and tests for) get_conflicting_overlapping_tasks and get_conflicting_overlapping_claims

Task #10811: added some initial tests on inserting tasks and claims and checking claim/task conflicts

Task #10810 - Postgres database is now created and populated for tests. Added some simple tests that directly operate on the database directly or through RADataBase.