changes to make Moore swallow upgrade MC

This contains several changes that were needed to get Moore running on upgrade MC using the upgrade reconstruction algorithms.

The main change is that RecoUpgradeTracking has been modified to return lists of algorithms instead of setting up sequences behind the scenes. This means it can be used in the Moore configuration more easily.

I also made a small change to the TrackBestTrackCreator configuration to make sure its list of input locations are provided in a deterministic order, as this was previously ill-defined (and has a small effect on the physics results).

Some drive-by tiny improvements to TrackBestTrackSplitter are also included.

Goes with Hlt!462 (merged) and Moore!117 (merged).