DM+FE: Create DG coordinate DS and add PetscFECreateFromSpaces()
- Refactor FE creation
- Create DS for DG coordinates
- Error on DG face coordinates

DM: Reorganized periodic coordinates into a separate representation
- Split coordinates into two representations
- No longer specify the boundary type for periodicity. We can tell if a
given boundary

DM: Reorganized periodic coordinates into a separate representation
- Split coordinates into two representations
- No longer specify the boundary type for periodicity. We can tell if a
given boundary is periodic by a positive L[d]
- Added DMPlexGetCellCoordinates_Internal() to get localized cell
coordinates automatically, and used in plexgeometry.c
- Moved coordinate functions into dmcoordinates.c
- Moved periodicity functions into dmperiodicity.c

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