add a --with-communications flag (renamed global 'comm')
use the new SD_PTG_dotload function
browse dag for debug only if log are enabled at the right level
Add comments
change functions
bug correction in set_precedence_levels
add missing include and comments
Use more comprehensive names
add comments
remove useless includes
add TODOs 
be consistent in function naming
add TODO
renaming + cleaning + TODO
reflect name changes
reflect name changes (still not usable)