Add Phrasebook to testsuite. Move grammars into subfolders. Add run-bench script.

testsuite/lpgf/walking/WalkingGer.gf

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+-- From Angelov, Bringert, Ranta (2009)
+concrete WalkingGer of Walking = {
+  lincat
+    S = Str ;
+    NP = {s : Str; n : Number; p : Person} ;
+    VP = {s : Number => Person => Str} ;
+  lin
+    And s1 s2 = s1 ++ "und" ++ s2 ;
+    Pred np vp = np.s ++ vp.s ! np.n ! np.p ;
+    John = {s = "John"; n = Sg ; p = P3} ;
+    We = {s = "wir"; n = Pl; p = P1} ;
+    Walk = {s = table {
+        Sg => table {
+          P1 => "gehe" ;
+          P2 => "gehst" ;
+          P3 => "geht"
+        } ;
+        Pl => table {
+          P1 => "gehen" ;
+          P2 => "geht" ;
+          P3 => "gehen"
+        }
+      }
+    } ;
+  param
+    Number = Sg | Pl ;
+    Person = P1 | P2 | P3 ;
+}