Removed unnecessary SelectType in VertexIteratorT::begin() and ::end().

[[Imported from SVN: r167]]

Adapted Agregation to the new clean interface.
Debugged all graph classes and the aggregator.

[[Imported from SVN: r166]]

[[Imported from SVN: r165]]

already existing graph.

[[Imported from SVN: r164]]

[[Imported from SVN: r163]]

from the matrix graph.

[[Imported from SVN: r162]]

[[Imported from SVN: r161]]

there.

Fixed it by creating a new doxygen module "Dense Matrix and Vector
Template Library" under Common for fmatrix.hh and fvector.hh

ISTL doxygen module is now defined in istl/istl.hh

[[Imported from SVN: r160]]

[[Imported from SVN: r159]]

[[Imported from SVN: r158]]

[[Imported from SVN: r157]]

[[Imported from SVN: r156]]

Where missing added copy constructor from mutable iterator to const
iterator.

[[Imported from SVN: r155]]

Not yet adapted for the parallel case.

[[Imported from SVN: r154]]

[[Imported from SVN: r153]]

[[Imported from SVN: r152]]

[[Imported from SVN: r151]]

[[Imported from SVN: r150]]

[[Imported from SVN: r149]]

[[Imported from SVN: r148]]

contain any entries at all.  This is needed because currently BCRSMatrix
doesn't allow rows that are completely empty.

[[Imported from SVN: r147]]

pointers to extern structs.

Therefor the MPITraits for the primitive datatypes did not work.

Fixed that and modified tests for running under lam4.

[[Imported from SVN: r146]]

[[Imported from SVN: r145]]

[[Imported from SVN: r144]]

[[Imported from SVN: r143]]

Test succeeds now!

[[Imported from SVN: r142]]

[[Imported from SVN: r141]]

Through template parameters arbituary properties can be attached to
the vertices and edges, respectively.

[[Imported from SVN: r140]]

[[Imported from SVN: r139]]

[[Imported from SVN: r138]]

[[Imported from SVN: r137]]

[[Imported from SVN: r136]]

[[Imported from SVN: r135]]

a set of (i,j) integer pairs.  Pairs can be added to the matrix
in any order.  A MatrixIndexSet can be used to initialize a
BCRSMatrix via the exportIdx method.

MatrixIndexSets are meant to help with the sometimes unwieldy
BCRSMatrix class.  If that class' handling gets easier, (or
if somebody explain to me how BCRSMatrix are really supposed
to be used), MatrixIndexSets may very well disappear again.

[[Imported from SVN: r134]]

[[Imported from SVN: r133]]

[[Imported from SVN: r132]]

[[Imported from SVN: r131]]

[[Imported from SVN: r130]]

- pass MPI_LIBS for MPI-implementations that need this

[[Imported from SVN: r129]]

[[Imported from SVN: r128]]