fix test failure when calling ds.all_features() by allowing a simple Box2d Query contructor - sidestepping issue of converting a python tuple to a boost tuple atm

bindings/python/mapnik/__init__.py

@@ -234,7 +234,7 @@ class _Datasource(Datasource,_injector):
     def field_types(self):
         return map(get_types,self._field_types())
     def all_features(self):
-        query = Query(self.envelope(),1.0)
+        query = Query(self.envelope())
         for fld in self.fields():
             query.add_property_name(fld)
         return self.features(query).features

bindings/python/mapnik_query.cpp

@@ -42,6 +42,7 @@ void export_query()
 
     class_<query>("Query", "a spatial query data object", 
                   init<box2d<double>,query::resolution_type const&,double>() )
+        .def(init<box2d<double> >())
         .def_pickle(query_pickle_suite())
         .add_property("resolution",make_function(&query::resolution,
                                                  return_value_policy<copy_const_reference>()))

include/mapnik/query.hpp

@@ -56,6 +56,13 @@ public:
           scale_denominator_(scale_denominator),
           filter_factor_(1.0)
     {}
+
+    query(box2d<double> const& bbox)
+        : bbox_(bbox),
+          resolution_(resolution_type(1.0,1.0)),
+          scale_denominator_(1.0),
+          filter_factor_(1.0)
+    {}
     
     query(query const& other)
         : bbox_(other.bbox_),