allow -0.0 as well as 0.0

Author: dimpase

src/sage/numerical/backends/cvxopt_backend.pyx

@@ -487,9 +487,9 @@ cdef class CVXOPTBackend(GenericBackend):
             100.0
             sage: N(g.solve(), digits=4)
             100.0
-            sage: N(g.get_values(xg[0]), 2)
+            sage: N(g.get_values(xg[0]), 2)       # abstol 1e-15
             0.00
-            sage: N(g.get_values(xg[1]), 2)
+            sage: N(g.get_values(xg[1]), 2)       # abstol 1e-15
             0.00
             sage: N(g.get_values(xg[2]), digits=4)
             100.0