we still need a compatible grid to test on

odd macrovertex ids are now the real vertices
added a GlobalIdType to gridfactory to have a better distinction between the global id and the index inside the vertexvector

dimension is 2 instead of 3.

fixed the 2d mapping of the vertices and gave neighbors the right flag in the markfornonconforming closure method

- instead of #ifndef NDEBUG
  now use #ifdef ALUGRIDDEBUG
- istead of assert( cond );
  now use alugrid_assert ( cond );
  (from dune/alugrid/common/alugrid_assert.hh)
So instead of having to define NDEBUG to avoid debug code being executed
(improves performance by 60%) one always avoids debug code as long as
ALUGRIDDEBUG has not been define.

cahnges.

different.