Issue #53: Move OpenMP, OpenMPI selection to before SuperBuild, so variable is available for external projects.
Issue #53: Move OpenMP, OpenMPI selection to before SuperBuild, so variable is available for external projects.

MattClarkson/CMakeCatchTemplate,MattClarkson/CMakeCatchTemplate,MattClarkson/CMakeCatchTemplate,MattClarkson/CMakeCatchTemplate