removed unused macro DIM_MAX that conflects with an Alberta macro

The macros DIM_MAX and DIM_OF_BND_MAX are not used anywhere and the DIM_MAX macro conflicts with macros from other libraries. So they are simply removed. The corresponding #undef DIM_MAX should be removed from dune-grid.

Thanks. The #undefs in dune-grid need updating anyway. That is done by manually calling the script undefAllMacros.pl in dune-grid. Would you consider doing that and posting the result as a MR?

merged

mentioned in commit 1637b2fa