Cosserat-Continuum-Nonplanar

@osander: Can you have a look here?

This MR cleans up the usage of MIXED_SPACE in cosserat-continuum.

Now all combinations of dim = dimworld or dim != dimworld and MIXED_SPACE = 0 or MIXED_SPACE = 1 at least compile.

Also, this MR points out the one combination that still can't be solved: Problems with dim != dimworld do not work for MIXED_SPACE = 1!

As soon as I need this for locking tests I will add this; I will have to change Nonplanarcosseratshellenergy so it can be assembled with the GFEMixedAssembler.

dune/gfe/parallel/globalp2mapper.hh

@@ -62,7 +62,7 @@ namespace Dune {
 
               case 0:  // element dofs
                 globalIndex = globalElementIndex.index(element.template subEntity<0>(entity))
-                              + globalVertexIndex.size(2);
+                              + globalVertexIndex.size(1);
                 break;
 
               default: