fix [#26601] Python error when use of autocomplete

Was a naming collision with 'keys' python method, reserve keys/items/values/get for python.
Updated animsys_update.py for shapekey data paths.

renamed:
  Particle.hair --> hair_keys
  Particle.keys --> particle_keys
  Key.keys --> key_blocks
  EnumProperty.items --> enum_items
  KeyMap.items --> keymap_items 

noted:
  http://wiki.blender.org/index.php/Dev:2.5/Py/API/Updates#Since_2.56a

release/scripts/modules/rna_info.py

@@ -207,7 +207,7 @@ class InfoPropertyRNA:
             self.fixed_type = None
 
         if self.type == "enum":
-            self.enum_items[:] = rna_prop.items.keys()
+            self.enum_items[:] = rna_prop.enum_items.keys()
             self.is_enum_flag = rna_prop.is_enum_flag
         else:
             self.is_enum_flag = False