[[Imported from SVN: r2965]]

as either homogeneous Neumann or Dirichlet

[[Imported from SVN: r2964]]

[[Imported from SVN: r2963]]

[[Imported from SVN: r2962]]

[[Imported from SVN: r2961]]

[[Imported from SVN: r2960]]

[[Imported from SVN: r2959]]

[[Imported from SVN: r2958]]

[[Imported from SVN: r2957]]

[[Imported from SVN: r2956]]

[[Imported from SVN: r2955]]

[[Imported from SVN: r2954]]

[[Imported from SVN: r2953]]

not so easy to remove them. Added some more "case" items to make simplex grids
work.

[[Imported from SVN: r2952]]

Note: There was a bug in UG/ug/gm/algebra.c, i.e. you have to update
UG as well.

[[Imported from SVN: r2951]]

[[Imported from SVN: r2950]]

[[Imported from SVN: r2949]]

[[Imported from SVN: r2948]]

[[Imported from SVN: r2947]]

[[Imported from SVN: r2946]]

(An edge can either be simplex or cube).

This implementation now assumes that a grid only uses ONE geometry type for
entities of codims dim and dim-1. It does not matter which one.

[[Imported from SVN: r2945]]

[[Imported from SVN: r2944]]

[[Imported from SVN: r2943]]

1) I will do also faces in 3D later.

2) LeafIndex will not work for locally refined meshes yet.

[[Imported from SVN: r2942]]

[[Imported from SVN: r2941]]

[[Imported from SVN: r2940]]

[[Imported from SVN: r2939]]

[[Imported from SVN: r2938]]

[[Imported from SVN: r2937]]

[[Imported from SVN: r2936]]

[[Imported from SVN: r2935]]

[[Imported from SVN: r2934]]

[[Imported from SVN: r2933]]

At least it compiles now ...

[[Imported from SVN: r2932]]

Nice to have for debugging and testing.

[[Imported from SVN: r2931]]

[[Imported from SVN: r2930]]

[[Imported from SVN: r2929]]

[[Imported from SVN: r2928]]

[[Imported from SVN: r2927]]

[[Imported from SVN: r2926]]