TODO.txt updated

pcbnew/scripting/TODO.txt

-* add MODULE::Add (see BOARD:Add), to make it more clean
-
-* Tell swig to forget automatic object deletion after adding
-  a BOARD_ITEM to MODULE object (it will be automatically deleted by MODULE,
-  leading to Segmentation Fault when unloading our python module (double free).
-  
-  It seems that we must do object.thisown=0 when added, may be adding a wrapper
-  Add function.
- 
-  
 * Implement iterator for NETCLASSES (NETCLASS) see class_netclass.h
 
 * Saving modules to library (in librairi.cpp)