[cmake] use infrastructure in dune-common to build Python packages

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

CMakeLists.txt

@@ -44,6 +44,9 @@ add_subdirectory(utils)
 
 if(dune-corepy_FOUND)
   add_subdirectory(python)
+  if(NOT (${DUNE_COMMON_VERSION} VERSION_LESS 2.6))
+    dune_python_install_package(PATH "python")
+  endif()
 endif()
 
 # finalize the dune project, e.g., generate config.h etc.

python/CMakeLists.txt

 add_subdirectory(dune)
 
-configure_file(setup.py.in setup.py)
+if(NOT (${DUNE_COMMON_VERSION} VERSION_LESS 2.6))
+  configure_file(setup.py.in setup.py)
+endif()

python/setup.py.in

@@ -3,7 +3,7 @@ from setuptools import setup, find_packages
 setup(name="dune.alugrid",
     namespace_packages=['dune'],
     description="Python lib for dune: dune-alugrid library",
-    version="2.4",
+    version="${DUNE_ALUGRID_VERSION}",
     author="Andreas Dedner and Martin Nolte",
     packages = find_packages(),
     zip_safe = 0,