[[Imported from SVN: r2979]]

[[Imported from SVN: r2978]]

[[Imported from SVN: r2977]]

Implemented neighbor access correctly to get lower level leaf in case
of locally refined meshes.

[[Imported from SVN: r2976]]

[[Imported from SVN: r2975]]

[[Imported from SVN: r2974]]

This ensures that codim 1 and dim-1 indices are correct also on locally refined meshes.
Further: face renumbering for _all_ element types, also in 2D

[[Imported from SVN: r2973]]

[[Imported from SVN: r2972]]

in local coordinates.

[[Imported from SVN: r2971]]

to refine all elements of a locally refined mesh.

[[Imported from SVN: r2970]]

Implemented assignment operator in AlbertaGridEntityPointer (hope its correct?).

[[Imported from SVN: r2969]]

ALUGrid specialists: Please provide a better implementation if there is one.

[[Imported from SVN: r2968]]

[[Imported from SVN: r2967]]

[[Imported from SVN: r2966]]

[[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]]