[bugfix] only create parameter files when not in-source build

cmake/modules/DuneFemDgMacros.cmake

 # the main files for all the tests are in the same dir
 set(FEMDG_MAIN_DIR "${CMAKE_SOURCE_DIR}/dune/fem-dg/main")
 
+set(GENERATE_FEMDG_PARAMETER_FILE TRUE)
+if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
+  set(GENERATE_FEMDG_PARAMETER_FILE FALSE)
+endif()
+
 include(Codegen)
 include(TargetDistclean)
-message(AUTHOR_WARNING "TODO: Implement module test.")

dune/fem-dg/test/advdiff/CMakeLists.txt

 dune_install( models.hh problemcreator.hh steppertraits.hh)
      
 include_directories("${CMAKE_SOURCE_DIR}/dune/fem-dg/test/advdiff/")
-configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+if(GENERATE_FEMDG_PARAMETER_FILE)
+  configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+endif()
 
 add_definitions( "-DYASPGRID" )
 add_definitions( "-DGRIDDIM=2" )

dune/fem-dg/test/combined/CMakeLists.txt

@@ -17,7 +17,9 @@ set(MAININCLUDE_PATH  "${dune-fem-dg_SOURCE_DIR}/dune/fem-dg/main/")
 include_directories(${MAININCLUDE_PATH})
 include_directories("${CMAKE_SOURCE_DIR}/dune/fem-dg/test/combined/")
 
-configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+if(GENERATE_FEMDG_PARAMETER_FILE)
+  configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+endif()
 
 add_executable(combinedall "${MAININCLUDE_PATH}/main.cc" 
                             "${MAININCLUDE_PATH}/main_0.cc" 

dune/fem-dg/test/euler/CMakeLists.txt

 dune_install( models.hh  problemcreator.hh  problems.hh )
 
 include_directories("${CMAKE_SOURCE_DIR}/dune/fem-dg/test/euler/")
-configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+if(GENERATE_FEMDG_PARAMETER_FILE)
+  configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+endif()
 
 add_definitions( "-DYASPGRID" )
 add_definitions( "-DGRIDDIM=2" )

dune/fem-dg/test/navierstokes/CMakeLists.txt

 dune_install( ns_model.hh problemcreator.hh ns_model_spec.hh thermodynamics.hh passtraits.hh)
 
 include_directories("${CMAKE_SOURCE_DIR}/dune/fem-dg/test/navierstokes/")
-configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter )
+if(GENERATE_FEMDG_PARAMETER_FILE)
+  configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter )
+endif()
 
 # default settings for the test case
 set(POLORDER 2)

dune/fem-dg/test/poisson/CMakeLists.txt

 dune_install( models.hh  problemcreator.hh  problems.hh )
 
 include_directories("${CMAKE_SOURCE_DIR}/dune/fem-dg/test/poisson/")
-configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
-                                
+if(GENERATE_FEMDG_PARAMETER_FILE)
+  configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+endif()
+
 set(POLORDER 2)
 add_definitions( "-DYASPGRID" )
 add_definitions( "-DGRIDDIM=2" )

dune/fem-dg/test/stokes/CMakeLists.txt

 dune_install(models.hh  problemcreator.hh  problems.hh  stokesalgorithm.hh  stokesassembler.hh  tensorhelper.hh)
      
 include_directories("${CMAKE_SOURCE_DIR}/dune/fem-dg/test/stokes/")
-configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+if(GENERATE_FEMDG_PARAMETER_FILE)
+  configure_file(parameter.in ${CMAKE_CURRENT_BINARY_DIR}/parameter)
+endif()
 
 add_definitions( "-DALUGRID_CUBE" )
 add_definitions( "-DGRIDDIM=2" )