DM: Move dimension up into DM
- Both DA and Plex had this and I think it makes sense

DMPlex+TS+Doc: Function docs

DMPlex+TS: Fixing types

PetscFV: Straighten out complex types

PetscFV+Plex: Refactored to put reconstruction routines in PetscFV_LeastSquares
- Added PetscFVComputeGradient()
- Added PetscFVLeastSquaresSetMaxFaces()
- Moved last squares fitting routines to Pets

PetscFV+Plex: Refactored to put reconstruction routines in PetscFV_LeastSquares
- Added PetscFVComputeGradient()
- Added PetscFVLeastSquaresSetMaxFaces()
- Moved last squares fitting routines to PetscFV_LeastSquares, and all the work space

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TS+Plex: Removed explicit use of "Face Sets" in favor of DMBoundary

DM+TS ex11: Removed redundant code
- Now use geometry from DMPlexTS
- Added DMPlexTSGetGeomtry() and declarations

DMPlex+TS: Massive overhaul
- Added LS capability, but need to move some things over to PetscFV
- Moved geometry setup and gradient setup inside
- Moved InsertBoundaryValues inside
- Switched to sett

DMPlex+TS: Massive overhaul
- Added LS capability, but need to move some things over to PetscFV
- Moved geometry setup and gradient setup inside
- Moved InsertBoundaryValues inside
- Switched to setting the RHSFunction directly so that my context does not get overwritten
- Need to replace use of "Face Sets" with BC information

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DMTS: Removed unused code

TS+DM: Added a Plex traversal for FV methods for RHS

Merge branch 'knepley/feature-plex-bc'

* knepley/feature-plex-bc:
DMPlex: Cells in the boundary marker should not be interpreted as constraints
DMPlex: Fix declaration
TS ex11: Replace ApplyBC

Merge branch 'knepley/feature-plex-bc'

* knepley/feature-plex-bc:
DMPlex: Cells in the boundary marker should not be interpreted as constraints
DMPlex: Fix declaration
TS ex11: Replace ApplyBC() with DMPlexInsertBoundaryValuesFVM()
DMPlex: Fixed DMPlexInsertBoundaryValuesFVM() - Remove redundant variable - Handle absence of id
TS ex11: Reorganization so that physics creation functions can take the DM - This required splitting the options block
DMPlex: DMPlexInsertBoundaryValues() --> DMPlexInsertBoundaryValuesFEM(), and added an FVM version - The FVM version depends on precalculated geometry which needs to be pulled into the library
TS ex11: Remove unused RHSFunction()
TS ex11: Remove Model from BC func - We do not want opaque objects outside of the context so we can pull this in the library
TS ex11: Now use TS infrastructure for local functions
DMPlex: Fix signature for IFunction - Note that the time is still not being passed down to the pointwise function
TS: Added local versions of assembly to DMTS - I was not sure whether everything was necessary
SNES ex62: Updated output
SNES ex12: Removed outdated BC handling - Removed unnecessary label completion - Updated output
DMPlex: Switched FEM assembly routines to use DMPlexInsertBoundaryValues()
DMPlex: Now DMPlexInsertBoundaryValue() only sets values for the given label - Added DMPlexProjectFunctionLabelLocal()
DMPlex: Now DMCreateSection() calls DMPlexLabelAddCells() - This is necessary for FEM boundary conditions, but we do not want it for FVM so we need some control divergence here soon
DMPlex: Added DMPlexLabelAddCells() - Needed this for FEM BC
DMPlex: Fix Gmsh test

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SNES & TS: remove stale comments about DMDAComputeFunction

TS: Added local versions of assembly to DMTS
- I was not sure whether everything was necessary

the compute Jacobian functions for SNES and TS now do not take a MatStructure flag

completed cleanup of removal of matrix pointers to compute jacobian routines

update changes file

fixed tao examples to no longer use Mat* arguments for Jacobian/Hessian etc computations

removed use of SNESFunction, SNESJacobianFunction etc as names in function arguments

Was ugly and stupid. Instead just use reasonable names and reference SNESFunction etc to
cause the manual page hy

removed use of SNESFunction, SNESJacobianFunction etc as names in function arguments

Was ugly and stupid. Instead just use reasonable names and reference SNESFunction etc to
cause the manual page hyperlinks to be made

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