ENH: Removed SUPERELASTIX_SUPERBUILD_DEBUG_CONFIGURATION option
ENH: Removed SUPERELASTIX_SUPERBUILD_DEBUG_CONFIGURATION option

CMAKE_CONFIGURATION_TYPES can now be edited directly by the user, and it set to Release by default. As discussed w/ Floris.

SuperElastix/SuperElastix,kaspermarstal/SuperElastix,SuperElastix/SuperElastix,kaspermarstal/SuperElastix,SuperElastix/SuperElastix,SuperElastix/SuperElastix,kaspermarstal/SuperElastix