move PetscCD into private
MatCoarsen-HEM: clean up and optimize
Merge branch 'barry/2023-11-06/doc-cleanup-man-page-processing' into 'main'Move doc/classic materials to doc/manualpagesSee merge request petsc/petsc!7000
Organize the Mat coloring, partitioning, coarsening, and ordering in a common directoryunder the SUBMANSEC of MatGraphOperations instead of MatOrderingsCommit-type: housekeeping
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