adding the .hh files from the ptflash folder

Author: GitPaean

CMakeLists_files.cmake

@@ -208,6 +208,13 @@ list (APPEND PUBLIC_HEADER_FILES
              opm/models/parallel/gridcommhandles.hh
              opm/models/parallel/mpibuffer.hh
              opm/models/parallel/threadedentityiterator.hh
+             opm/models/ptflash/flashindices.hh
+             opm/models/ptflash/flashintensivequantities.hh
+             opm/models/ptflash/flashlocalresidual.hh
+             opm/models/ptflash/flashmodel.hh
+             opm/models/ptflash/flashnewtonmethod.hh
+             opm/models/ptflash/flashprimaryvariables.hh
+             opm/models/ptflash/flashproperties.hh
              opm/models/pvs/pvsboundaryratevector.hh
              opm/models/pvs/pvsratevector.hh
              opm/models/pvs/pvsindices.hh