Copy/Move entries between listes

[LevPetrovitch]

The title already says it: I'd like to have the possibility to move an entry from a list to another (says from the "missing items" list to the "buy now" one). Besides the move operation, the copy operation (where the copied item stays on the original list too) would also be useful (e.g. copy entry "milk" from list "basic staples" to list "buy now").
If these operations could be done on multiple items in one operation it would be even better.