[[Imported from SVN: r5691]]

[[Imported from SVN: r5689]]

remove Neumann boundary data code.  Neumann problems are not always conservative --> I need to do some more thinking

[[Imported from SVN: r5687]]

[[Imported from SVN: r5636]]

[[Imported from SVN: r5098]]

[[Imported from SVN: r5088]]

[[Imported from SVN: r5085]]

[[Imported from SVN: r5084]]

[[Imported from SVN: r5062]]

[[Imported from SVN: r4973]]

[[Imported from SVN: r4474]]

[[Imported from SVN: r4153]]

[[Imported from SVN: r4081]]

[[Imported from SVN: r4055]]

[[Imported from SVN: r4036]]

now works on a per-element basis and has been moved to the local rod assembler.
That way, it has lost most of its 1d-ness.  In the future, it will be usable
for other problems as well.

[[Imported from SVN: r4019]]

The class 'Configuration' is now called 'RigidBodyMotion', and can be parametrized by the space dimension

[[Imported from SVN: r4003]]

[[Imported from SVN: r4001]]

[[Imported from SVN: r3500]]

[[Imported from SVN: r3488]]

[[Imported from SVN: r3284]]

[[Imported from SVN: r2927]]

[[Imported from SVN: r2303]]

[[Imported from SVN: r2015]]

[[Imported from SVN: r1768]]

[[Imported from SVN: r1716]]

[[Imported from SVN: r1715]]

moved the quadrature orders for bending and shear stuff into the header, as a first step towards reduced integration

[[Imported from SVN: r1714]]

[[Imported from SVN: r1713]]

[[Imported from SVN: r1712]]

[[Imported from SVN: r1701]]

[[Imported from SVN: r1700]]

[[Imported from SVN: r1698]]

[[Imported from SVN: r1677]]

[[Imported from SVN: r1524]]

[[Imported from SVN: r1506]]

Add a method to assemble the Hessian matrix by a finite difference
approximation.

[[Imported from SVN: r1504]]

fixed one indexing bug in the hessian computation; added various helper methods for the derivatives of the strains and fd approximations for them

[[Imported from SVN: r1501]]

[[Imported from SVN: r1472]]

[[Imported from SVN: r1220]]