Add FilterTracks processor to filter tracks.

[kkrizka]

Originally written by @njbruhwiler.

A processor that filters a track collection. The input and output collections are set via InputTrackCollectionName and OutputTrackCollectionName parameters.

The available track properties to filter on are:

• BarrelOnly: Keep tracks with only barrel hits.
• NHitsTotal: Minimum number of hits on track
• NHitsVertex: Minimum number of hits on vertex detector
• NHitsInner: Minimum number of hits on inner tracker
• NHitsOuter: Minimum number of hits on outer tracker
• MinPt: Minimum transverse momentum
• Chi2Spatial: Spatial chi squared

[gianelle]

Hi,
is it possible to use a more generic approach likes the one used in the RefitFinal, which accepts cuts for hits using something like:
< detID >, < detI D>,... < lower threshold >

For example:

• to require n hits on vertex you writes: 1,2 n
• if you want n hits on inner + vertex barrel writes: 1,3,4 n

A second request is if it is possible to put the "hits requests" in OR condition instead of AND, this because you can
always create AND condition calling the filter more times.

With these two changes we can remove the filter from the RefitFinal processor, using this one instead (which seems a
more correct approach) .

Ale