Merge pull request #512 from CEED/valeria/some_cleanup

Small fixes and cleanups

Remove inclusion of ceed.h in examples/ header files

Add double inclusion guard in examples/petsc header files

PETSc BPs on the cubed-sphere (#463)

* Add setupsphere.c and bpssphere.c and improve doc of area problems

* Improve doc of area.c

* Areasphere: improve doc

* Update Makefile for bpssphere

PETSc BPs on the cubed-sphere (#463)

* Add setupsphere.c and bpssphere.c and improve doc of area problems

* Improve doc of area.c

* Areasphere: improve doc

* Update Makefile for bpssphere

* Use Sqr define in area/areasphere.okl

* BPs on the sphere: Add BP1 and BP2

* Update ./gitignore for bpssphere

* BPs on the sphere: Use MatSetNullSpace for Laplace operator

* BPs on the sphere: Add BP3

* Style fix in navierstokes.c

* ceed/ex2-surface: remove ununsed M_PI_2 define

* BP3: Use different rhs and true_soln functions

* bpssphere: normalize quadrature point coordinates to sphere

* Remove extra DMSetFromOptions() call in SetupDMByDegree function

* Add bp3sphere.okl

* Update bpssphere problems after interface change in PR #447

* Make style

* Update TESTARGS

* Fix make style change

* Slightly increase the tolerance for test_mode

* Update bp2sphere.h and bp2sphere.okl with asymmetric formulation consistent with PR #464

* Add BP4

* Enable BP5/BP6

* Add bp4sphere.okl and style

* Update after Strided Restrictions and latest updates in PETSc

* change booleans to PetscBooleans

Not to be pedantic, but this change was suggested by my IDE ^_^

* examples: s,pysical,physical, and small comment

* Simplify unnecessary bidimensional matrices

Co-authored-by: jeremylt <jeremy.thompson@colorado.edu>
Co-authored-by: Jed Brown <jed@jedbrown.org>

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Add PETSc example areaplex (#394)


Update bps files with new subfolders structure

* Add header h and okl files

* Update REAMDE.md