[FIX] base: fix SignedIntConverter weight

This allow to keep route with an SignedIntConverter with more
priority than a StringConverter.

The default wight is 100, so force the weight to 50 (default intConverter)
was also a fix. But we decide to rewrite the SignedIntConverter based on the
intConverter of WerkZeug.

So now, a controller '/module/<string:xmlid>', will be matched after
'/module/<int:id>". (Same behaviour that before the commit 800ae13712)

openerp/addons/base/ir/ir_http.py

@@ -54,18 +54,9 @@ class ModelsConverter(werkzeug.routing.BaseConverter):
     def to_url(self, value):
         return ",".join(i.id for i in value)
 
-class SignedIntConverter(werkzeug.routing.BaseConverter):
-    def __init__(self, url_map):
-        super(SignedIntConverter, self).__init__(url_map)
-
-    def to_python(self, value):
-        try:
-            return int(value)
-        except ValueError:
-            raise werkzeug.routing.ValidationError()
-
-    def to_url(self, value):
-        return str(value)
+class SignedIntConverter(werkzeug.routing.NumberConverter):
+    regex = r'-?\d+'
+    num_convert = int
 
 
 class ir_http(osv.AbstractModel):