Add support for multiline value.

Default behaviour of split() is to act on any whitespace char, which includes
' ' and '\n'.

stack/erp5.cfg

@@ -243,14 +243,14 @@ initialization =
   import Zope2
   os.environ['SOFTWARE_HOME'] = os.path.abspath(os.path.dirname(os.path.dirname(Zope2.__file__)))
   os.environ['ZOPE_SCRIPTS'] = ''
-  temp_bt5_path_list = ['/'.join(['''${buildout:parts-directory}''', x, 'bt5']) for x in '''${erp5_repository_list:repository_id_list}'''.split(' ')]
+  temp_bt5_path_list = ['/'.join(['''${buildout:parts-directory}''', x, 'bt5']) for x in '''${erp5_repository_list:repository_id_list}'''.split()]
   bt5_path_list = []
   [bt5_path_list.extend([bt5_path, '%s/*' % bt5_path]) for bt5_path in temp_bt5_path_list]
   os.environ['erp5_tests_bt5_path'] = ','.join(bt5_path_list)
-  sys.path[0:0] = ['/'.join(['''${buildout:parts-directory}''', x, 'tests']) for x in '''${erp5_repository_list:repository_id_list}'''.split(' ')]
+  sys.path[0:0] = ['/'.join(['''${buildout:parts-directory}''', x, 'tests']) for x in '''${erp5_repository_list:repository_id_list}'''.split()]
   import glob
   product_test_path_list = []
-  [product_test_path_list.extend(glob.glob('/'.join(['''${buildout:parts-directory}''', x, 'product/*/tests']))) for x in '''${erp5_repository_list:repository_id_list}'''.split(' ')]
+  [product_test_path_list.extend(glob.glob('/'.join(['''${buildout:parts-directory}''', x, 'product/*/tests']))) for x in '''${erp5_repository_list:repository_id_list}'''.split()]
   sys.path[0:0] = product_test_path_list
 
 [test_suite_runner]
@@ -272,7 +272,7 @@ initialization =
   import Zope2
   os.environ['SOFTWARE_HOME'] = os.path.abspath(os.path.dirname(os.path.dirname(Zope2.__file__)))
   os.environ['ZOPE_SCRIPTS'] = ''
-  sys.path[0:0] = ['/'.join(['''${buildout:parts-directory}''', x]) for x in '''${erp5_repository_list:repository_id_list}'''.split(' ')]
+  sys.path[0:0] = ['/'.join(['''${buildout:parts-directory}''', x]) for x in '''${erp5_repository_list:repository_id_list}'''.split()]
 
 [instance-recipe-egg]
 recipe = zc.recipe.egg