The Dirichlet nodes are handled directly via the ignoreNodes_ field.
I don't know how the matrix modification code ever got in here.

Removing the code doesn't seem to make any difference.  I find that
a bit surprising: I would expect multigrid and IPOpt to work better
if the matrix is truly symmetric.

[[Imported from SVN: r9742]]

Much easier to use than the previous API.

[[Imported from SVN: r9735]]

[[Imported from SVN: r9734]]

[[Imported from SVN: r9732]]

[[Imported from SVN: r9731]]

[[Imported from SVN: r9729]]

After much back and forth: this is the correct way.  This size cannot
be taken from the transfer operators, because these operators exist
only if there is more than one level.

[[Imported from SVN: r9728]]

[[Imported from SVN: r9727]]

[[Imported from SVN: r9726]]

That works for fe spaces of all orders.

[[Imported from SVN: r9725]]

[[Imported from SVN: r9724]]

[[Imported from SVN: r9723]]

Christian Engwer told me a trick how to get the mpiHelper instance without
known argc and argv.

[[Imported from SVN: r9720]]

[[Imported from SVN: r9710]]

[[Imported from SVN: r9614]]

We have the correct value in the variable 'oldEnergy' anyway.

[[Imported from SVN: r9575]]

Because the gradient is needed anyway when computing the Hesse matrix.
Not computing it separately a second time shaves off about 8% wall time
of each iteration.

[[Imported from SVN: r9555]]

[[Imported from SVN: r9451]]

And set the inner loop solver verbosity to QUIET

[[Imported from SVN: r9435]]

This number is nowadays infered from the number of transfer operators.

[[Imported from SVN: r9432]]

Since ADOL-C is not multi-threaded we will not be using OpenMP
in the foreseeable future.  And on a single-threaded code the
OpenMP timer and the Dune timer return the same values anyway.

[[Imported from SVN: r9431]]

[[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]]