fix duneproject to create working CMakeLists.txt

bin/duneproject

@@ -470,8 +470,8 @@ project($PROJECT CXX)
 
 #find dune-common and set the module path
 find_package(dune-common)
-list(APPEND CMAKE_MODULE_PATH ${dune-common_MODULE_PATH}
-  "${CMAKE_SOURCE_DIR}/cmake/modules")
+list(APPEND CMAKE_MODULE_PATH \${dune-common_MODULE_PATH}
+  "\${PROJECT_SOURCE_DIR}/cmake/modules")
 
 #include the dune macros
 include(DuneMacros)