[[Imported from SVN: r8345]]

This is safer, because calling the constructor implicitly
can lead to unwanted quaternion normalization.
(happened to me...)

[[Imported from SVN: r8344]]

Even though multiplication of Rotations is the same thing
as multiplication of Quaternions, in the first case the
output is a Rotation class, and in the second on a Quaternion
class.

[[Imported from SVN: r8343]]

[[Imported from SVN: r8342]]

[[Imported from SVN: r8333]]

the fe functions on two different refinements of the same base grid.

[[Imported from SVN: r8331]]

[[Imported from SVN: r8330]]

[[Imported from SVN: r8329]]

Use the long form for the quadratic energy stiffness.  I tested it: when kappa=1 is does the same as the short form

[[Imported from SVN: r8308]]

[[Imported from SVN: r8307]]

to set the shear correction factor.

[[Imported from SVN: r8290]]

[[Imported from SVN: r8277]]

[[Imported from SVN: r8276]]

[[Imported from SVN: r8261]]

[[Imported from SVN: r8260]]

[[Imported from SVN: r8257]]

[[Imported from SVN: r8242]]

[[Imported from SVN: r8240]]

store all local dofs for all elements.

This leads to some redundancy, but it scales to 
higher polynomial orders.

[[Imported from SVN: r8239]]

[[Imported from SVN: r8238]]

[[Imported from SVN: r8237]]

[[Imported from SVN: r8234]]

[[Imported from SVN: r8233]]

[[Imported from SVN: r8221]]

[[Imported from SVN: r8220]]

[[Imported from SVN: r8219]]

from a Pk-basis to a P1-basis.

Doesn't work beyond P2 yet, I'll fix that in a second.

Should eventually go into dune-solvers.

[[Imported from SVN: r8218]]

[[Imported from SVN: r8214]]

Quaternion class to the Rotation class.  Rotation axes and
angles are a genuine rotation concept and don't really
belong into a quaternion implementation.

[[Imported from SVN: r8207]]

[[Imported from SVN: r8199]]

[[Imported from SVN: r8182]]

[[Imported from SVN: r8164]]

[[Imported from SVN: r8162]]

[[Imported from SVN: r8156]]

target space classes.  In particular, the coordinate type
now has to be given explicitly.

[[Imported from SVN: r8149]]

It makes it difficult to be sure that an explicitly
requested type is really handed over to every place.

While we are at it: reverse the order of the template
parameters.  Now first comes the type, then the dimension.
This is more like FieldVector and friends, and hence
should be less confusing.

[[Imported from SVN: r8148]]

[[Imported from SVN: r8146]]

[[Imported from SVN: r8145]]

[[Imported from SVN: r8115]]

[[Imported from SVN: r8111]]