mmg: tidy and preserve all face tags

plex ex60: handle determinant and test

plex metric: compute determinant when modifying metric

Fix DMView_Plex_ASCII to have clearer indications of what the numbers after i-cells are (per rank)

Update the test output files

Commit-type: debugability
\spend 45m

Merge remote-tracking branch 'origin/release'

Plex+Doc: Function doc

plex ex60: update outputs for passing cell tags

plex ex19: pass NULL cell tags to DMAdaptMetric

dm adapt: preserve cell tags

parmmg: avoid unnecessary loops

plex metric: print matrix if LAPACK fails

plex ex20: reduce verbosity of output

plex ex60: update args and outputs

plex ex60: no need to create sections

plex ex3: set metric options

plex ex19: use dm_adaptor arg

plex adapt: finish integration of Mmg and ParMmg

Note that the interfaces for Pragmatic, Mmg
and ParMmg now exist in their own subdirectories

plex metric: routines for controlling Mmg and ParMmg

DM: Take over management of mesh generators and adaptors from DMPlex
- Change adaptLabel signature to match adaptMetric
- Move mesh generator list from DMPlex to DM
- DMAdaptLabel() and DMAdaptMetric

DM: Take over management of mesh generators and adaptors from DMPlex
- Change adaptLabel signature to match adaptMetric
- Move mesh generator list from DMPlex to DM
- DMAdaptLabel() and DMAdaptMetric() now check this list
- Register metric adaptation packages
- Change -dm_plex_generator to -dm_generator
- Change -dm_plex_adaptor to -dm_adaptor

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plex adapt: copy in Nicolas Barral's work on Mmg

This is a partial copy of:
repo: https://gitlab.com/taupalosaurus/petsc.git
branch: barral/plex-adapt-mmg
commit: 98956700dc63d1435c4f7f7458d4bebe12b

plex adapt: copy in Nicolas Barral's work on Mmg

This is a partial copy of:
repo: https://gitlab.com/taupalosaurus/petsc.git
branch: barral/plex-adapt-mmg
commit: 98956700dc63d1435c4f7f7458d4bebe12b8adde

show more ...

plex adapt: copy in Thomas Vigier's work on MMG

This is a partial copy of :
repo: https://gitlab.com/optimisation-de-maillage-petsc-chp/petsc.git
branch: thomas/test
commit: ab0f579e4be9c77bc112ec55

plex adapt: copy in Thomas Vigier's work on MMG

This is a partial copy of :
repo: https://gitlab.com/optimisation-de-maillage-petsc-chp/petsc.git
branch: thomas/test
commit: ab0f579e4be9c77bc112ec55db7bcac1aaac15f7

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plex create: pull out mapping lv->gv for CreateFromListParallel

noticed missing CHKERRQ in plexhdf5.c

plex: add LogEvents

add dm_impls_plex_tests-ex55_10% testing datafile backward compatibility