* Included the sources of zoltan in the code, the library is tricky to
compile and not widely used, so it is better this way. As this library
is open source, eventually we should remove metis. The sources
included are only a part of the distribution tarball (essentially
src/). 

* There are still some parts of the source code that aren't needed and
I will remove them in future commits.

* I Wrote the routines to call Zoltan from Octopus and perform the
mesh partitioning and it works. It can be enabled by setting the
variable MeshPartition to zoltan (by default is metis)..

* Even though Zoltan has a Fortran interface I used the C one, as the
Fortran code is a mess to compile with autotools.

* Currently it will only work for pure domain parallelization, as it
uses MPI_COMM_WORLD as communicator. Do you know if it possible to
convert a Fortran communicator into a C one?