[[Imported from SVN: r9997]]

[[Imported from SVN: r9832]]

[[Imported from SVN: r9831]]

[[Imported from SVN: r9830]]

In particular, I can use math.cos in the initial values.

[[Imported from SVN: r9808]]

And add a little quirk: I don't know how to do 'import math' in dunepython yet.
Therefore I have to replace the cosine in the initial configuration by a
series expansion...

[[Imported from SVN: r9804]]

[[Imported from SVN: r9797]]

[[Imported from SVN: r9784]]

[[Imported from SVN: r9781]]

[[Imported from SVN: r9692]]

[[Imported from SVN: r9668]]

[[Imported from SVN: r9658]]

[[Imported from SVN: r9545]]

[[Imported from SVN: r9291]]

[[Imported from SVN: r9275]]

- set mu_c to 0
- introduce the shear correction factor 'kappa'

[[Imported from SVN: r8328]]

[[Imported from SVN: r8327]]

[[Imported from SVN: r8326]]

[[Imported from SVN: r7546]]

[[Imported from SVN: r7432]]

using the ideas of Patrizio Neff.

In particular, this code should handle real 3d continua, as well
as Neff-style Cosserat shells.

This initial commit only adds a lot of infrastructure.

[[Imported from SVN: r7339]]

[[Imported from SVN: r5726]]