Rename Zero grammar to Walking

testsuite/lpgf/WalkingEng.gf

@@ -0,0 +1,19 @@
+-- From Angelov, Bringert, Ranta (2009)
+concrete WalkingEng of Walking = {
+  lincat
+    S = Str ;
+    NP = {s : Str; n : Number} ;
+    VP = {s : Number => Str} ;
+  lin
+    And s1 s2 = s1 ++ "and" ++ s2 ;
+    Pred np vp = np.s ++ vp.s ! np.n ;
+    John = {s = "John"; n = Sg} ;
+    We = {s = "we"; n = Pl} ;
+    Walk = {s = table {
+        Sg => "walks";
+        Pl => "walk"
+      }
+    } ;
+  param
+    Number = Sg | Pl ;
+}