Use ExprStmt pretty much everywhere where it should be used.

ExprStmt is now really a normal statement. All the other statements are from now on considered legacy code. As a side effect this increases the parser pickling version.

jedi/cache.py

@@ -243,7 +243,7 @@ def save_parser(path, name, parser, pickling=True):
 
 class ParserPickling(object):
 
-    version = 15
+    version = 16
     """
     Version number (integer) for file system cache.