bugfix in computeAveragePressure: use the proper embedding of intersections into elements when integrating over the boundary

[[Imported from SVN: r7105]]

[[Imported from SVN: r7086]]

This is done by solving a mass matrix system.

[[Imported from SVN: r6891]]

[[Imported from SVN: r6846]]

[[Imported from SVN: r6819]]

[[Imported from SVN: r6810]]

[[Imported from SVN: r6809]]

[[Imported from SVN: r6671]]

[[Imported from SVN: r6668]]

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]]

These are needed for general Steklov-Poincare methods.

[[Imported from SVN: r6592]]

set IPOpt print_level to 0 if Solver::QUIET is requested.  Negative values appear not to be allowed anymore

[[Imported from SVN: r6591]]

[[Imported from SVN: r6541]]

hack: add explicit cast to FieldVector to compile the code again after the introduction of DenseVector in dune-common

[[Imported from SVN: r6390]]

[[Imported from SVN: r5931]]

[[Imported from SVN: r5728]]

[[Imported from SVN: r5347]]

[[Imported from SVN: r5324]]

[[Imported from SVN: r5061]]

[[Imported from SVN: r5004]]

[[Imported from SVN: r4971]]

[[Imported from SVN: r4514]]

[[Imported from SVN: r4474]]

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

[[Imported from SVN: r4003]]

[[Imported from SVN: r2615]]

[[Imported from SVN: r2422]]

[[Imported from SVN: r2421]]

[[Imported from SVN: r2420]]

[[Imported from SVN: r2417]]

[[Imported from SVN: r2362]]

[[Imported from SVN: r2281]]

[[Imported from SVN: r2202]]

[[Imported from SVN: r2062]]

[[Imported from SVN: r2061]]

[[Imported from SVN: r2045]]

[[Imported from SVN: r2040]]

[[Imported from SVN: r2038]]

[[Imported from SVN: r2036]]