Expand regrowing options

[brownd1978]

This PR adds the ability to regrow a Ptr list (selection) of LoopHelix KalSeeds, and to deep-copy the associated KalSeedMCs, to allow regrowing only selected tracks. If this feature is generally useful it could be added to regrowKinematicLine as well. Or perhaps it's time to merge these into a single module.

I also started moving some regrowing fcl into Offline prolog.

[FNALbuild]

Hi @brownd1978,
You have proposed changes to files in these packages:

• Mu2eKinKal
• TrkReco

which require these tests: build.

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⌛ The following tests have been triggered for f8fceca: build (Build queue - API unavailable)

About FNALbuild. Code review on Mu2e/Offline.

[FNALbuild]

☀️ The build tests passed at f8fceca.

Test	Result	Details
test with	✅	Command did not list any other PRs to include
merge	✅	Merged f8fceca at 3d84f93
build (prof)	✅	Log file. Build time: 04 min 15 sec
ceSimReco	✅	Log file.
g4test_03MT	✅	Log file.
transportOnly	✅	Log file.
POT	✅	Log file.
g4study	✅	Log file.
cosmicSimReco	✅	Log file.
cosmicOffSpill	✅	Log file.
ceSteps	✅	Log file.
ceDigi	✅	Log file.
muDauSteps	✅	Log file.
ceMix	✅	Log file.
rootOverlaps	✅	Log file.
g4surfaceCheck	✅	Log file.
trigger	✅	Log file.
check_cmake	✅	Log file.
FIXME, TODO	✅	TODO (0) FIXME (0) in 2 files
clang-tidy	➡️	4 errors 32 warnings
whitespace check	✅	no whitespace errors found

N.B. These results were obtained from a build of this Pull Request at f8fceca after being merged into the base branch at 3d84f93.

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