[MERGE] use terminal_width() for pending-merge display

[Alexander Belchenko]

Adeodato Simó пишет:
> Hi. From the NEWS file:
> 
>   | * On Unix, detect terminal width using an ioctl not just $COLUMNS.
>   |   Use terminal width for single-line logs from ``bzr log --line`` and
>   |   pending-merge display.  (Robert Widhopf-Fenk, Gustavo Niemeyer)
> 
> However, the fix merged in rev. 1707 only changed `bzr log --line`,
> leaving status.py untouched.
> 
> The attached small patch fixes the code to match the NEWS entry.

+1. And nice to have this in upcoming 0.9 release.

--
Alexander