cancel button for cancelling the running of python scripts

```
12:38:15 < celeron55> some kind of a cancel button would be nice in case a
                      python script jams or it just takes too long for it 
to
                      complete
12:38:32 < celeron55> i have such problems fairly often
12:38:44 < DanHeeks> yes, I agree

```

Original issue reported on code.google.com by `celeron55@gmail.com` on 3 Mar 2009 at 12:05
