HPDDM cleanup

• rename -ksp_hpddm_krylov_method into -ksp_hpddm_type, cf. e5cd072e (comment 223668210)
• make generatefortranstubs.py handle .cxx and consequently fix MOAB and ViennaCL Fortran stubs (generated twice from the .cu and .cxx)
• fix PCHPDDM and KSPHPDDM missing Fortran stubs, cf. !2426 (comment 268266320)
• synchronize include/petsc/finclude/petscpc.h and include/petsc/finclude/petscksp.h with their C counterpart
• new examples src/ksp/ksp/examples/tutorials/ex75f.F90 and src/ksp/ksp/examples/tutorials/ex76f.F90
• handle KSPHPDDM options in KSPSetFromOptions_HPDDM, not in HPDDM library
• bump hpddm.py version
• fix out-of-source compilation in SLEPc, cf. slepc/slepc!24 (merged)
• add KSPView_HPDDM