DM+DT: Fix for equation copying
- Use PetscWeakFormCopy() in PetscDSCopyEquations()
- Replace labels in DMCopyDS()
- More debugging in FE

FE: Fix non-affine integration
- The test function gradients were being pushed forward with the wrong
Jacobian
- Affine worked because the last Jacobian was always being used

DT: Changed key and WeakForm internals
- Changed name to PetscFormKey
- Added part member
- Now maps are referred to by PetscWeakFormKind
- Added PetscWeakFormClearIndex() and PetscWeakFormClear()

DT: Changed key and WeakForm internals
- Changed name to PetscFormKey
- Added part member
- Now maps are referred to by PetscWeakFormKind
- Added PetscWeakFormClearIndex() and PetscWeakFormClear()
- Passing NULL to SetIndex is now ignored
- Added tests

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Plex: DMPlexComputeJacobian_Hybrid_Internal() updated to uses keys
- Need to translate points from original DM to auxiliary DM for hybrid aux values

FE: Check number of function rather than pointer

DMField: Fix bug in face data
- The supporting cells should be evaluated on the original quadrature,
not a different cell quadrature that is not saved

DM+Plex: Boundary integration functions are now stored in a PetscWeakForm held in the Boundary object
- Boundary residual/Jacobian functions now take a form key
- Now store DMLabel in DSBoundary
- Im

DM+Plex: Boundary integration functions are now stored in a PetscWeakForm held in the Boundary object
- Boundary residual/Jacobian functions now take a form key
- Now store DMLabel in DSBoundary
- Improved Boundary, Weak Form, and DS viewers
- Remove DMCopyBoundary(), DMCopyDisc() is sufficient
- Need DMTransferDS_Internal() to create new DS with label in the correct DM
- Correct all DMAddBoundary() in tests
- Allow DMBoundary to hold just a label name if necessary since p4est is missing labels in a lot of places
- Fix propagating coordinate dimension in DS

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DS+FE+Doc: Make BdResidual take a key
- Add documentation