Start adding kinetic scheme

dune/gdt/local/numerical-fluxes/kinetic.hh

dune/gdt/momentmodels/entropyflux.hh

dune/gdt/momentmodels/entropyflux_implementations.hh

dune/gdt/momentmodels/entropyflux_kineticcoords.hh

dune/gdt/momentmodels/hessianinverter.hh

dune/gdt/operators/advection-fv-entropybased.hh

dune/gdt/operators/reconstruction/internal.hh

dune/gdt/operators/reconstruction/linear.hh

dune/gdt/operators/reconstruction/linear_kinetic.hh

dune/gdt/operators/reconstruction/slopes.hh

dune/gdt/test/entropic-coords-mn-discretization.hh

.../gdt/test/hyperbolic__momentmodels__entropic_coords_mn.cc

dune/gdt/tools/timestepper/adaptive-rungekutta.hh