don't store the continuum interface boundary in the Steklov-Poincare step -- use the one from the complex instead

[[Imported from SVN: r6797]]

[[Imported from SVN: r6796]]

ake the interfaceBoundary a LeafBoundaryPatch, instead of a vector of LevelBoundaryPatches, and remove the hacks associated with the latter

[[Imported from SVN: r6793]]

[[Imported from SVN: r6792]]

After all, we are thinking 'Steklov-Poincare' here, which means
we are solving an equation on the interface.  The old code
taking into account the subdomain solutions wasn't really satisfying:
in particular, it was not symmetric wrt the subdomains.

[[Imported from SVN: r6762]]

[[Imported from SVN: r6761]]

[[Imported from SVN: r6757]]

[[Imported from SVN: r6755]]

[[Imported from SVN: r6749]]

[[Imported from SVN: r6747]]

[[Imported from SVN: r6744]]

[[Imported from SVN: r6737]]

[[Imported from SVN: r6736]]

[[Imported from SVN: r6720]]

[[Imported from SVN: r6717]]

[[Imported from SVN: r6697]]

[[Imported from SVN: r6677]]

This is a snapshot commit.  It compiles, but I haven't actually dared
to run it yet.

[[Imported from SVN: r6675]]

[[Imported from SVN: r6674]]

Kinda stupid... but the new implementation is shorter, and it is merged into the old
method.

[[Imported from SVN: r6599]]

It was a RigidBodyMotion before, but the rotation part of that was
ignored.  Semantically it is just a position, hence a FieldVector
is better.

[[Imported from SVN: r6598]]

[[Imported from SVN: r6597]]

[[Imported from SVN: r6596]]

Only Dirichlet-Neumann is complete and appears to work, but it is
not really tested yet.

[[Imported from SVN: r6593]]

[[Imported from SVN: r6538]]

[[Imported from SVN: r5939]]

[[Imported from SVN: r5724]]

[[Imported from SVN: r5347]]

The rod forces need to be flipped.  That used to be in getResultantForce, but here is a better place

[[Imported from SVN: r5107]]

[[Imported from SVN: r5089]]

[[Imported from SVN: r5080]]

[[Imported from SVN: r4880]]

[[Imported from SVN: r4879]]

[[Imported from SVN: r4878]]

[[Imported from SVN: r4877]]

[[Imported from SVN: r4876]]

[[Imported from SVN: r4475]]

[[Imported from SVN: r4100]]

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

[[Imported from SVN: r4003]]

[[Imported from SVN: r3990]]