Patch by Jonathan Youett

[[Imported from SVN: r10056]]

I don't see an elegant way to make this work for a P3 space, even on a single
processor.  Since I need P3 measurements real soon now, I just disable the
entire code.  Not nice.

[[Imported from SVN: r10047]]

This is much cleaner than handing over the Grid only, and then trying
to guess the basis using the preprocessor.  After all, the
RiemannianTrustRegionSolver calls the assembler, so it may know the
function space basis.

[[Imported from SVN: r10035]]

By introducing a factory class that produces GlobalMapper and LocalMapper
types for a given dune-fufem-style function space basis.

[[Imported from SVN: r10034]]

[[Imported from SVN: r9994]]

Because it is not an index, it really is a mapper.

[[Imported from SVN: r9953]]

[[Imported from SVN: r9936]]

In particular this means having to carry mappers for the local indices around.
This makes the code more verbose, but it also makes it easier to see what is
happening.  While coding this stuff I keep having doubts about whether all
the renumbering works correctly...

[[Imported from SVN: r9925]]

The global indexing infrastructure does not currently support P3 spaces.

[[Imported from SVN: r9924]]

The local copy was to get the thing developed and working.  Now that it is
working we upstream it into dune-grid.

[[Imported from SVN: r9922]]

Yes it is to be moved to dune-grid, but for the transition it is
easier to use the one from this module.

[[Imported from SVN: r9916]]

[[Imported from SVN: r9903]]

[[Imported from SVN: r9878]]

[[Imported from SVN: r9834]]

The hasObstacle_ and obstacles_ fields are now single arrays.
The corresponding fields for the entire grid hierarchy is assembled
within dune-solvers now.

[[Imported from SVN: r9816]]

[[Imported from SVN: r9762]]

[[Imported from SVN: r9727]]

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

[[Imported from SVN: r9720]]

[[Imported from SVN: r9708]]

Offer setInitialIterate instead

[[Imported from SVN: r9429]]

[[Imported from SVN: r9428]]

[[Imported from SVN: r8234]]

[[Imported from SVN: r7842]]

[[Imported from SVN: r7837]]

[[Imported from SVN: r7611]]

[[Imported from SVN: r7029]]

[[Imported from SVN: r6835]]

[[Imported from SVN: r6670]]

Compute the local corrections in local coordinates on the tangent bundle now, instead of using the embedding in the surrounding space

[[Imported from SVN: r5985]]

[[Imported from SVN: r5984]]

For this now the TangentVector class of S^n has only n components,
while the EmbeddedTangentVector class still has n+1.
The code around it needs to be fixed accordingly.

[[Imported from SVN: r5963]]

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: r5931]]

[[Imported from SVN: r5927]]

[[Imported from SVN: r5559]]

[[Imported from SVN: r5347]]

[[Imported from SVN: r4137]]

[[Imported from SVN: r4132]]

[[Imported from SVN: r4131]]