Add enum to PackedCandidate and functions to MiniFloatConverter to aid validation

[makortel]

This PR changes PackedCandidate to use enum instead of magic constants for track hit masks and shifts, and adds bunch of std::numeric_limits style functions to MiniFloatConverter (+unit tests for those). I need both for upcoming improvements in PackedCandidateTrackValidator (which I prefer to integrate separately to show that the changes here do not affect results).

Tested in 760pre3 and rebased on top of CMSSW_8_0_X_2015-10-28-1100. No changes expected in monitored quantities.

@rovere @VinInn @arizzi @gpetruc

[cmsbuild]

A new Pull Request was created by @makortel (Matti Kortelainen) for CMSSW_8_0_X.

Add enum to PackedCandidate and functions to MiniFloatConverter to aid validation

It involves the following packages:

DataFormats/PatCandidates

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
@gpetruc this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[makortel]

ping

[arizzi]

I think this is ok with me and @gpetruc but we are not the one expected to sign off in github

[davidlange6]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/9506/console

[cmsbuild]

+1
Tested at: a0726eb
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12226/9506/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12226/9506/summary.html