Added suport for both failure and success for the OStoreDB::ArchiveJob() and tested the job's basic requeuing on failure.

Fixed the MigrationReportPackerTest and changed the MigrationReportPacker to be more similar to the RecallReportPacker

This reverts commit 62a1f856.

Conflicts:

	scheduler/CMakeLists.txt

Re-instated the starting state which is necessary to prevent scheduling race conditions.

Moved PositioningMethod into the cta namespace to allow for easier modification of RetrieveJob for unit testing

This version of DummyScheduler is all but useless for unit tests
due to its demanding constructor.  I am adding this class to the
cta repository all the same so that more than one developer can
work on it.

Made the methods of the cta::Scheduler class virtual so that they can be overidden by Mock/Dummy/Fake classes

Added as comments DataTransferSessionTest.cpp and TaskWatchDogTest.cpp to the appropriate CMakeLists.txt file

Improved the RecallReportPackerBadBadEnd test, though it still does not pass because the expected error log is never created

RecallReportPackerNominal in the context of the CTA project

Started the mount selection logic in the OStoreDB.

Please note that I still must complete the remaining unit tests
within the RecallReportPackerTest.cpp file.