src/sage/all__sagemath_polyhedra.py: Add sage.arith.all

Author: mkoeppe

src/sage/all__sagemath_polyhedra.py

@@ -2,6 +2,7 @@
 
 from sage.misc.all__sagemath_polyhedra import *
 from sage.rings.all__sagemath_polyhedra import *
+from sage.arith.all import *
 from sage.modules.all import *
 from sage.matrix.all import *
 from sage.geometry.all__sagemath_polyhedra import *