BUG: Add missing CMake command to configure doxyfile.out
BUG: Add missing CMake command to configure doxyfile.out

Restored `configure_file` call that was removed on Apr 6, 2016,
with commit "ENH: No more need for deep copying images...", b366643bc23374f545d4b6a11d4e1991bcdef1ed

SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix