Replace default definition of basemap_datadir

Author: molinav

lib/mpl_toolkits/basemap/__init__.py

@@ -61,7 +61,8 @@
     if not os.path.isdir(basemap_datadir):
         raise RuntimeError('Path in environment BASEMAPDATA not a directory')
 else:
-    basemap_datadir = os.sep.join([os.path.dirname(__file__), 'data'])
+    from mpl_toolkits import basemap_data
+    basemap_datadir = os.path.dirname(basemap_data.__file__)
 
 __version__ = '1.2.2+dev'