rename curvedsurfacegrid to curvedgrid

CMakeLists.txt

cmake/modules/CMakeLists.txt

cmake/modules/DuneCurvedgridMacros.cmake

config.h.cmake

dune-curvedgrid.pc.in

dune.module

dune/CMakeLists.txt

dune/curvedgrid/CMakeLists.txt

dune/curvedgrid/backuprestore.hh

dune/curvedgrid/capabilities.hh

dune/curvedgrid/concepts.hh

dune/curvedgrid/curvedgrid.hh

dune/curvedgrid/datahandle.hh

dune/curvedgrid/declaration.hh

dune/curvedgrid/entity.hh

dune/curvedgrid/entityseed.hh

dune/curvedgrid/geometries/CMakeLists.txt

dune/curvedgrid/geometries/ellipsoid.hh

dune/curvedgrid/geometries/explicitsurface.hh

dune/curvedgrid/geometries/implicitsurface.hh