add free_mem to C10_Catalog.py

catalog/C10_Catalog.py

@@ -499,6 +499,10 @@ class Catalog(CatalogBase):
         else:
             print("number of objects in catalog: ", len(self.objs))
 
+    def free_mem(self, **kward):
+        self.starDDL.freeGlobeData()
+        del self.starDLL
+
     def load_sed(self, obj, **kwargs):
         if obj.type == 'star':
             # _, wave, flux = tag_sed(