Implement configurable DT hit uncertainties from DB

[namapane]

First version of object definition, dictionary and tools for storing and using configurable DT hit uncertainties from the DB. In this initial version, the reconstruction code does not access the DB yet, so there is no change in reconstruction. Please accept this PR so we can proceed with populating the DB.

[cmsbuild]

A new Pull Request was created by @namapane (Nicola Amapane) for CMSSW_7_1_X.

Implement configurable DT hit uncertainties from DB

It involves the following packages:

CalibMuon/DTCalibration
CondCore/DTPlugins
CondFormats/DTObjects
CondFormats/DataRecord
RecoLocalMuon/DTRecHit
Validation/DTRecHits

@apfeiffer1, @diguida, @danduggan, @rovere, @cmsbuild, @anton-a, @thspeer, @rcastello, @deguio, @slava77, @ggovi, @Degano, @ojeda, @nclopezo can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2835/467/summary.html

[slava77]

These cvs remnants ($... $) should be removed

[diguida]

+1
class version to be reviewed, ok for the moment.

[apfeiffer1]

+1

[deguio]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes (tests are also fine). @nclopezo, @ktf can you please take care of it?