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

testsuite/lpgf/phrasebook/PhrasebookDan.gf

@@ -0,0 +1,9 @@
+--# -path=.:present:alltenses
+
+concrete PhrasebookDan of Phrasebook = 
+  GreetingsDan,
+  WordsDan ** open 
+    SyntaxDan,
+    Prelude in {
+
+}