Give SRG test cases human-readable names.

test/srg/cyclic-indirect/cyclic-indirect.gf

@@ -0,0 +1,11 @@
+-- a grammar with an indirect cycle
+
+cat S; G;
+
+fun f : S ;
+fun fg : G -> S ;
+fun gf : S -> G ;
+
+lin f  = { s = "f" } ;
+lin fg x = x;
+lin gf x = x;