Remove deprecated support for ALUGrid.

dumux/decoupled/common/fv/mpfa/fvmpfaproperties.hh

dumux/io/adaptivegridrestart.hh

dumux/io/gridcreator.hh

test/decoupled/1p/test_diffusion3d.cc

test/decoupled/1p/test_diffusionproblem3d.hh

test/decoupled/2p/test_3d2p.cc

test/decoupled/2p/test_3d2pproblem.hh

test/decoupled/2p/test_impesadaptive.cc

test/decoupled/2p/test_impesadaptiveproblem.hh

test/decoupled/2p/test_impesadaptiverestart.cc

test/decoupled/2p/test_mpfa2p.cc

test/decoupled/2p/test_mpfa2pproblem.hh

test/decoupled/2p2c/test_adaptive2p2c2d.cc

test/decoupled/2p2c/test_adaptive2p2c2dproblem.hh

test/decoupled/2p2c/test_adaptive2p2c3d.cc

test/decoupled/2p2c/test_adaptive2p2c3dproblem.hh

test/freeflow/navierstokes/navierstokestestproblem.hh

test/freeflow/navierstokes/test_navierstokes.cc

test/implicit/1p/1ptestproblem.hh

test/implicit/2p/lensproblem.hh