Merge branch 'features' into refactor_function_field

Author: Matthias Koeppe

src/sage/features/standard.py

@@ -31,6 +31,5 @@ def all_features():
             PythonModule('primecountpy', spkg='primecountpy'),
             PythonModule('ptyprocess', spkg='ptyprocess'),
             PythonModule('requests', spkg='requests'),
-            PythonModule('rpy2', spkg='rpy2'),
             PythonModule('scipy', spkg='scipy'),
             PythonModule('sympy', spkg='sympy')]