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.

problems/film-on-substrate.parset

@@ -59,7 +59,7 @@ initialDeformation = "x"
 #############################################
 
 # Inner solver, cholmod or multigrid
-solvertype = multigrid
+solvertype = trustRegion
 
 # Number of homotopy steps for the Dirichlet boundary conditions
 numHomotopySteps = 1