So, the Cylinders and Weigthsystems got a new Trash icon,
and the interface already intercepts the clicks ( on all
columns ) and send this to the 'remove' method on boch
models. On the model I'm just filtering the indexes that
are not 'DELETE' and creating a stub method to be filled
later.
Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>