[[Imported from SVN: r6910]]

[[Imported from SVN: r6909]]

[[Imported from SVN: r6908]]

[[Imported from SVN: r6907]]

[[Imported from SVN: r6905]]

[[Imported from SVN: r6899]]

[[Imported from SVN: r6847]]

[[Imported from SVN: r6841]]

[[Imported from SVN: r6839]]

[[Imported from SVN: r6836]]

[[Imported from SVN: r6831]]

[[Imported from SVN: r6830]]

[[Imported from SVN: r6822]]

[[Imported from SVN: r6821]]

[[Imported from SVN: r6818]]

[[Imported from SVN: r6813]]

[[Imported from SVN: r6803]]

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]]