Fix for broken antlr3 in stand-alone install

Restored and updated the permanent symlinks and updated setup.cfg
to facilitate proper standalone installation of antlr3 w congress.

Change-Id: I7b603bcf3785374d5e83d0e5a98669dbd93d8cd9

antlr3runtime/Python/antlr3

@@ -0,0 +1 @@
+../../thirdparty/antlr3-antlr-3.5/runtime/Python/antlr3/

antlr3runtime/Python3/antlr3

@@ -0,0 +1 @@
+../../thirdparty/antlr3-antlr-3.5/runtime/Python3/antlr3/

congress/datalog/compile.py

@@ -40,12 +40,12 @@ _congressDir = os.path.dirname(
     os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 if six.PY2:
     sys.path.append(_congressDir +
-                    "/thirdparty/antlr3-antlr-3.5/runtime/Python/")
+                    "/antlr3runtime/Python/")
     from congress.datalog.Python2 import CongressLexer
     from congress.datalog.Python2 import CongressParser
 else:
     sys.path.append(_congressDir +
-                    "/thirdparty/antlr3-antlr-3.5/runtime/Python3/")
+                    "/antlr3runtime/Python3/")
     from congress.datalog.Python3 import CongressLexer
     from congress.datalog.Python3 import CongressParser
 import antlr3

setup.cfg

@@ -22,7 +22,8 @@ classifier =
 [files]
 packages =
     congress
-    antlr3
+    antlr3runtime/Python/antlr3
+    antlr3runtime/Python3/antlr3
 
 [global]
 setup-hooks =