Examples
ex1.c: Tests ISLocalToGlobalMappingCreateIS() for bs > 1.
ex2.c: Tests ISView() and ISLoad()
ex3.c: Tests ISSetBlockSize() on ISBlock().
ex4f.F90:
ex5.c: Tests PetscSectionView()/Load() with HDF5.
ex6.c: Tests ISRenumber.
ex7.c: Tests ISLocalToGlobalMappingGetInfo() and ISLocalToGlobalMappingGetNodeInfo().
ex8.c: Tests ISLocalToGlobalMappingView() and ISLocalToGlobalMappingLoad()