Otherwise the visibility attribute is ignored.

This patch improves debugging of MPI communications:
* It detects inconsistencies between dataHandle.size and dataHandle.gather
* It checks whether dataHandle.scatter reads bytes the correct amoutn of bytes
* It makes the tag number independent of the template arguments Grid and DataHandle

use infrastructure in dune-common to build Python packages

See merge request !11

In dune-common 2.6+ the infrastructure for creating Python packages is
included. This patch replaces our own infrastructure by the core
implementation

add move constructor to SPGrid

See merge request !10

The default constructor predates the introduction of BackupRestoreFacility
and is no longer necessary.

In order to specialize FieldTraits for JacobianTransposed /
JacobianInverseTransposed, these classes can no longer be subclasses of
our GeometryCache.

[geometrycach] add method determinant to JacobianTransposed and JacobianInverseTansposed to be consistent with densematrix interface

See merge request !8

[geometrycache] add method determinant to JacobianTransposed and JacobianInverseTransposed to be consistent with densematrix interface

[geometrycache] add field traits for JacobianTransposed and JacobianInverseTransposed

See merge request !9

[bugfix] use correct CMake variable to check whether dune-corepy was found

See merge request !7

[bugfix] add missing header to make headercheck pass

See merge request !6

[bugfix] make nightly builds compile after changes in subIndex interface.

The recent change subIndex in the dune-grid interface seems to cause a problem in dune-fem. 
@martin.nolte: Please take a look. The suggested change at least make the code compile.

See merge request !5

remove genericgeometry subdirectory from dune-geometry

The removal of the genericgeometry subdirectory in dune-geometry will require some minor changes to dune-spgrid. This merge request collects those and should be merged once the corresponding branch in dune-geometry is merged, too.

See merge request !4