Particle Ancestry Map Fix

[henrylay97]

When this object was created in #34 I mistakenly did not declare the member functions to be const. This causes problems for obvious reasons when this object is used after being written to the artroot file. This PR should address that.

[FNALbuild]

A new Pull Request was created by @henrylay97 (Henry Lay) for develop.

It involves the following packages:

lardataobj

@LArSoft/level-1-managers, @LArSoft/level-2-managers can you please review it and eventually sign? Thanks.

cms-bot commands are listed here

[FNALbuild]

The code-checks are being triggered in jenkins.

[FNALbuild]

+code-checks

[knoepfel]

trigger build

[FNALbuild]

The tests are being triggered in jenkins.

[FNALbuild]

+LArSoft tests OK on slf7 for c7:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/19546&builds=
+build

[FNALbuild]

+LArSoft tests OK on slf7 for e20:prof
for details see
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+build

[FNALbuild]

-argoneut tests failed on slf7 for e20:prof
for details see
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[FNALbuild]

-icarus tests failed on slf7 for e20:prof
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[lgarren]

trigger build

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The tests are being triggered in jenkins.

[FNALbuild]

-sbnd tests warning on slf7 for e20:prof
for details see
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[FNALbuild]

-uboone tests warning on slf7 for e20:prof
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[FNALbuild]

-dune tests tests failed on slf7 for e20:prof
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for details of the parent CI build see
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[FNALbuild]

+LArSoft tests OK on slf7 for c7:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/19550&builds=
+build

[FNALbuild]

+LArSoft tests OK on slf7 for e20:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/19551&builds=
+build

[FNALbuild]

-argoneut tests failed on slf7 for e20:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:argoneut/view_builds/index?offset=0&builds=argoneut_ci/8556&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/19551&builds=

[FNALbuild]

-icarus tests failed on slf7 for e20:prof
for details see
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for details of the parent CI build see
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[FNALbuild]

-uboone tests warning on slf7 for e20:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:uboone/view_builds/index?offset=0&builds=uboone_ci/9095&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/19551&builds=

[FNALbuild]

-sbnd tests warning on slf7 for e20:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:sbnd/view_builds/index?offset=0&builds=sbnd_ci/11972&builds=
for details of the parent CI build see
https://lar-ci-history.fnal.gov/LarCI/app/view_builds/index?offset=0&builds=lar_ci/19551&builds=

[FNALbuild]

-dune tests tests failed on slf7 for e20:prof
for details see
https://lar-ci-history.fnal.gov/LarCI/app/ns:dune/view_builds/index?offset=0&builds=dune_ci/15510&builds=
for details of the parent CI build see
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[lgarren]

approve

[FNALbuild]

This pull request is fully signed and it will be merged to develop and built in the next LArSoft release after it passes the integration tests.