Show marked-up estimated or true finish time in text view.

Close #1121.

Backward compatibility with 5.4.14 suite daemon tested.

@benfitzpatrick - please review.

![gcylc-tfinish](https://cloud.githubusercontent.com/assets/2362137/4085366/b1be4a52-2f1a-11e4-88da-c117a94c1619.png)