a function in MfemCmakeUtilities.cmake, applying various tweaks.
Use the new cmake variable MFEM_MPI_NP when running the parallel
tests.
Remove the config variable MFEM_CPPFLAGS - it is not really used
anywhere. Also, remove the variables MFEM_MPIEXEC and
MFEM_MPIEXEC_NP since these values are autodetected by CMake.
Fix a warning in ex18.hpp.
In the makefile buidl system set MFEM_LIB_FILE to the versioned
shared library (when building shared) instead of the non-versioned
link.
Stowell, Mark L