Moving refinement into dune/grid/common.

Makefile.am

am/Makefile.am

am/inkscape.am

configure.ac

doc/Doxyfile

doc/Makefile.am

grid/common/Makefile.am

grid/common/refinement.hh

grid/common/refinement/Makefile.am

grid/common/refinement/base.cc

grid/common/refinement/hcube.cc

grid/common/refinement/hcubetriangulation.cc

grid/common/refinement/referencetokuhn0.png

grid/common/refinement/referencetokuhn0.svg

grid/common/refinement/simplex.cc

grid/common/refinement/simplexvertexindex.png

grid/common/refinement/simplexvertexindex.svg

grid/common/virtualrefinement.cc

grid/common/virtualrefinement.hh

m4/Makefile.am