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Add Dependency Tracking to dune-py Module

See merge request !17

can be reused in a time loop

When the structure of dune-py changes, we simply bump the version number
(revision) of the dune-py module. Upon a release, we will update the major and
minor number and reset the revision number.

If the version of an existing dune-py module does not equal the version we would
generate ourselves, we issue a runtime error, asking the user to remove the
dune-py directory.

Instead of generating one CMake target "generated_module", we now define a
CMake target for every module create in dune-py. Before loading the module,
we always call cmake to make sure the module is rebuilt if dependencies change.

Note: Changes in the source code of the generated module remain untracked for
      now.

Building Python modules through Pybind11 is a recurring task in our
Python bindings. To reduce maintainance in the build system, we introduce
a CMake function "dune_add_pybind11_module", which is semantically inspired
by the "dune_add_test" function.

updated installation and fix a problem with the setup.py.in configuration file not being copied to the build directory

Update pybind11 to version 2.1.1

See merge request !15

coordinate together with the entity. The wrapper behaves like the
corresponding global coordinate but stores entity and local coordinate for
use in local evaluations

Merge branch 'feature/pybind11-2.1.1' of ssh://gitlab.dune-project.org:22022/staging/dune-corepy into feature/pybind11-2.1.1

This is basically a copy of detail::make_default_metaclass with two
additions:
* You can specify a name for the metaclass
* The return value is object instead of PyType *.

allow registering non-copyconstructbile dense vector implementations

See merge request !13

In this case, all operations requiring copy construction, like '+', '-', etc.
will not be available in Python.

[cmake] 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 initial pickling support for grids

See merge request !9