[CR] eat from ground

Portion of Items from smashed vending machine:

![1](https://cloud.githubusercontent.com/assets/6351438/3555098/82775fae-0913-11e4-9cc2-70753551b5a6.png)

Press `[E]`, press `Esc`:
All items from vending machine (doubles excluded):
![2](https://cloud.githubusercontent.com/assets/6351438/3555105/9f8b7288-0913-11e4-9133-eae04549e52f.png)


About keybinding: I played ADoM before and if you stand on edible item and use [E]at key, game asks you for eating some on the ground. It not uncomfortably. 

This innovation does not spoil, and simplifies the interface and usability. User can always use the old behavior.

Just try this and you like it. I think.