PetscDualSpace_Lagrange: setup recursively on dimension

This simplifies the code and covers cases (facets of cells) that weren't
covered before.

Quadrature: Fix creation init

PetscDualSpace_Lagrange: order functions now go after tuple used

PetscDualSpace_Lagrange: use lexicographic order for nodes

PetscDualSpaceLagrange: added tensor setting

We should be able to have discontinuous tensor spaces, which are useful,
e.g., in nodal DG methods. When setting up a default finite element, we
try to

PetscDualSpaceLagrange: added tensor setting

We should be able to have discontinuous tensor spaces, which are useful,
e.g., in nodal DG methods. When setting up a default finite element, we
try to set up the tensor setting of the dual space to match the tensor
setting of the primal space.

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PetscDS: fix _Basic creation and destruction

PetscDS: add missing PetscDSCopyBoundary, fix copy loops

DM: set PetscDS from options in DMSetFromOptions()

DM: transfer boundary methods to PetscDS

Plex: Remove unused variables

PetscFV: Added -petscfv_compute_gradients

PetscDS: Added GetFieldIndex() and GetFieldSize()
- Fix to accept FV as well

PetscFE: If all Jac pointwise functions are NULL, do not evaluate

Plex: Added PetscDSHasJacobian()

PetscFE+OpenCL: Fixed OpenCL residual eval for new interface

Plex+SNES+TS: Pass time and shift down into residual and Jacobian kernels, and the boundary kernels
- Added time into ComputeRHS/IFunction

fix a variety of set but not used variables in examples detected by clang static analyzer

minor code formatting as well

PetscFV: Dual space must set DM before the dimension

PetscFE: Simple dual space must define getNumDof()

Merge branch 'knepley/fix-plex-blocksize'

* knepley/fix-plex-blocksize:
Plex ex12: Mark p4est requirements
Plex: Fix line geometry - There was a bad dependency
Plex: Fix FVM geometry - There w

Merge branch 'knepley/fix-plex-blocksize'

* knepley/fix-plex-blocksize:
Plex ex12: Mark p4est requirements
Plex: Fix line geometry - There was a bad dependency
Plex: Fix FVM geometry - There was a bad dependency
Plex: Fixed possibly bad access
PetscFE: Fixed missing initializations
PetscFE: PetscDualSpaceGetNumDof() can no longer return NULL - Had to implement it for Simple dual space
DM: Protect possibly NULL input
Plex: Fixed parallel block size for DM matrix
DM: Fixed block size for LocalToGlobal mapping with PetscSection

Conflicts:
config/builder.py

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