Code review comment for lp:~gang65/ubuntu-calculator-app/reboot_copy_selected_calculation

Do we really need to copy the date in the clipboard?
I copied a couple of calculation as test and the date just stand in the way without a real meaning, see:
[Wed Jan 14 23:20:19 2015 GMT+0100] 2+6=8
[Wed Jan 14 23:20:19 2015 GMT+0100] -10^2/5=-20
The actual calculation is short, while the date and time takes a lot of space. I'd like also to discuss about this with rpadovani :)

Also, we may want to support the "copy to clipboard" for a single entry, be swiping the list item to the left, similarly to delete, which is shown with a swipe to right gesture.

I also left a comment inline.