allow to edit comment instead of adding a new one on every push or to hide previous comments

[abenhamdine]

there would be 3 modes :

• 'new' : add a new comment on every run
• 'hide' : add a new comment and hide previous comments
• 'edit' : edit always a single comment

[abenhamdine]

edit mode has been impletended by #471

only the hide is still not implemented

[abenhamdine]

I close it because hide mode is not really needed