This is how the new dune-functions bases should be used.  Also, it is yet
another step towards merging CosseratEnergyLocalStiffness and MixedCosseratEnergy.

Conceptually cleaner, and makes for simpler code.  Most importantly, we will want
to pass the Basis::LocalView to the local assemblers.  For that we need the actual
basis, not just the grid view and local finite element.

[[Imported from SVN: r10082]]

... so much difficult code obsolete now... AD rocks...

[[Imported from SVN: r10010]]

[[Imported from SVN: r9379]]

[[Imported from SVN: r9307]]

Because nowadays, it may not be a FieldMatrix anymore

[[Imported from SVN: r9305]]

[[Imported from SVN: r9302]]

[[Imported from SVN: r9301]]

[[Imported from SVN: r8242]]

[[Imported from SVN: r8182]]

Computation of analytical energy gradients doesn't work, yet.

[[Imported from SVN: r7839]]

[[Imported from SVN: r7837]]

[[Imported from SVN: r7617]]

[[Imported from SVN: r7611]]

[[Imported from SVN: r7553]]

[[Imported from SVN: r7416]]

using a finite-difference approximation only for the derivative
of the gfe gradients wrt coefficients.

[[Imported from SVN: r7230]]

[[Imported from SVN: r7228]]

[[Imported from SVN: r7227]]

[[Imported from SVN: r7131]]

[[Imported from SVN: r7030]]

[[Imported from SVN: r7024]]

transpose one gradient matrix.  This makes the code run, but it still doesn't work even for RealTuple<1>

[[Imported from SVN: r6547]]

[[Imported from SVN: r6500]]

[[Imported from SVN: r6498]]

übersetzt jetzt und stürzt nicht ab.  Es kommt allerdings noch Unfug raus.

[[Imported from SVN: r6451]]

[[Imported from SVN: r6297]]

[[Imported from SVN: r5931]]

[[Imported from SVN: r5807]]

[[Imported from SVN: r5741]]

[[Imported from SVN: r5594]]

[[Imported from SVN: r5567]]

[[Imported from SVN: r5566]]

[[Imported from SVN: r4472]]

[[Imported from SVN: r4077]]

[[Imported from SVN: r4069]]

[[Imported from SVN: r4059]]

[[Imported from SVN: r4034]]

[[Imported from SVN: r4033]]