[[Imported from SVN: r9393]]

These were only there to hack our way around a bug in the
interface of the Rotation class.  This bug has been fixed
quite a while ago.

[[Imported from SVN: r9293]]

[[Imported from SVN: r9292]]

    
The Dune timers do not return wall time when using thread parallelism.

[[Imported from SVN: r9283]]

[[Imported from SVN: r8983]]

[[Imported from SVN: r8982]]

[[Imported from SVN: r8981]]

Another easy patch which makes the code a lot faster.

Also, this patch removes the quasi-Newton code.  So far that code
hasn't helped at all.  Quasi-Newton methods will need more work
in the future.

[[Imported from SVN: r8588]]

[[Imported from SVN: r8330]]

[[Imported from SVN: r8277]]

[[Imported from SVN: r8261]]

[[Imported from SVN: r8234]]

[[Imported from SVN: r7960]]

[[Imported from SVN: r7868]]

[[Imported from SVN: r7867]]

[[Imported from SVN: r7843]]

[[Imported from SVN: r7837]]

[[Imported from SVN: r7611]]

notably the almost-equivalent UnitVector<4>: A vector with three entries
is interpreted by the UnitVector<4> class as a tangent vector given in
the basis returned by orthonormalFrame.  That is correct as it works
for all kinds of manifolds.  On the other hand, the Rotation<3> class
interprets as a 3x3 skew matrix (a tangent vector at the identity in
the matrix representation) even though the implementation used quaternion
coordinates.

To trick around this the use of exp methods with FieldVector<3> is avoided
by this patch.  A real fix would involve introducing a SkewMatrix class
and using that in Rotation<3>.

[[Imported from SVN: r7575]]

[[Imported from SVN: r7554]]

[[Imported from SVN: r7430]]

[[Imported from SVN: r7428]]

[[Imported from SVN: r7366]]

[[Imported from SVN: r7365]]

[[Imported from SVN: r7354]]

[[Imported from SVN: r7034]]

[[Imported from SVN: r6542]]

remove the possibility to solve the inner problem with a truncated cg.  It never really worked and complicates the code

[[Imported from SVN: r5951]]

[[Imported from SVN: r5938]]

[[Imported from SVN: r5931]]

[[Imported from SVN: r5927]]

[[Imported from SVN: r5347]]

[[Imported from SVN: r5023]]

[[Imported from SVN: r4972]]

[[Imported from SVN: r4876]]

[[Imported from SVN: r4197]]

[[Imported from SVN: r4176]]

[[Imported from SVN: r4131]]

[[Imported from SVN: r4115]]

new method to setup a solver using a truncated cg as the inner solver.  This compiles, but it doesn't work yet

[[Imported from SVN: r4105]]