DMP4est: simplify DMForestTemplate() interface

Now when you want to create dmAdapted from dm,
just call

DMForestTemplate(dm,MPI_COMM_NULL,&dmAdapted).

If you called DMSetUp(dmAdapted) right af

DMP4est: simplify DMForestTemplate() interface

Now when you want to create dmAdapted from dm,
just call

DMForestTemplate(dm,MPI_COMM_NULL,&dmAdapted).

If you called DMSetUp(dmAdapted) right after this, the topology of
dmAdapted would essentially be a copy of dm, but you can do things like
set adaptivity labels, change the overlap, and change the partitioning
before calling set up, and then all of those changes will be executed in
DMSetUp().

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WIP: Simplify/correct adaptivity interface for DMForest

Merge branch 'tisaac/dmforest' of bitbucket.org:petsc/petsc into tisaac/dmforest

DMForest: switch adaptivity from an array of markers to label

Now that labels are general, it makes more sense

DMForest: added DMIsForest() and DMForestRegisterType()

DMP4est: implement hierarchical transfer SFs

Each cell creates a list of the points in its closure that have dofs in
the scheme, and a PetscSFNode is created for each point in that closure.
Then, th

DMP4est: implement hierarchical transfer SFs

Each cell creates a list of the points in its closure that have dofs in
the scheme, and a PetscSFNode is created for each point in that closure.
Then, the coarse mesh is transfered to overlap the first, so that cell
overlap from fine to coarse can be determined. Then, in looping over
the closure lists of the fine cells, we can match fine points to their
containing coarse points, which allows construction of a point-transer
SF, which can then be expanded into a dof transfer SF.

WIP DMP4est: repartitioning coarse to match fine

WIP DMP4est: factor out coarse/fine overlap code

WIP DMP4est: finally on the right track with the transfer PetscSF

DMP4est: finished DMPforetGetCellCoveringSF

WIP DMP4est: use the covering cells to compute the transfer SF

DMP4est: first completion of DMPforestGetTransferSF()

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DMP4est: work on coarsening

1) We want the coarse mesh to inherit as many options as possible from
the parent, so there is now a DMForestTemplate() method for this type of
operation

2) Partitioning

DMP4est: work on coarsening

1) We want the coarse mesh to inherit as many options as possible from
the parent, so there is now a DMForestTemplate() method for this type of
operation

2) Partitioning for coarsening is a major p4est option, so I added it to
the DMP4est interface

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DMForest: introduce initial refinement level.

The idea being that, when a minimum and an initial refinement level are
specified, then a hierarchy is created that spans them, much like
-dm_plex_refin

DMForest: introduce initial refinement level.

The idea being that, when a minimum and an initial refinement level are
specified, then a hierarchy is created that spans them, much like
-dm_plex_refine_hierarchy.

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DMForest: completion of most interface routines.

Forest: try a minimal class

DMForest: start impl with struct definition

Started DMForest interface