Fix bug #670845: cut & clear in the output window now work, in that   - clear clears the entire buffer   - cut doesn't cut, but copies.
Fix bug #670845: cut & clear in the output window now work, in that
  - clear clears the entire buffer
  - cut doesn't cut, but copies.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator