Distribution: Fixed interface to DMPlexDistribute()
Fixes to comments.
Updated Distributor Python object for removal of partitioner parameter.

The 'partitioner' parameter is now a PETSc setting.
Update Distributor for moving partitioner to PETSc setting.
Fixed partitioner settings.
Use PETSc partitioner setting.
Merge branch 'knepley/upgrade-petsc-master'

* knepley/upgrade-petsc-master:
  Use PETSc partitioner setting.
  Fixed partitioner settings.
  Update Distributor for moving partitioner to PETSc setting.
  Updated Distributor Python object for removal of partitioner parameter.
  Fixes to comments.
  Distribution: Fixed interface to DMPlexDistribute()
More updates for partitioner setting to PETSc.
Merge branch 'knepley/upgrade-petsc-master'

* knepley/upgrade-petsc-master:
  More updates for partitioner setting to PETSc.
Merge branch 'master' into willic3/fix-plasticity

* master:
  More updates for partitioner setting to PETSc.
  Use PETSc partitioner setting.
  Fixed partitioner settings.
  Update Distributor for moving partitioner to PETSc setting.
  Updated Distributor Python object for removal of partitioner parameter.
  Fixes to comments.
  Distribution: Fixed interface to DMPlexDistribute()
Some changes to plasticity section plus changed version of LyX to older
version.