[PATCH] obtain terminal_width via curses

[Robert Widhopf-Fenk]

The attached patch modifies "bzr log --log-format line" to
use the actual terminal width instead of a hard coded 79.  

Further osutils.py:terminal_width() is modified to use the
curses module to get the current terminal width.

In order to avoid flickering due to subsequent calls to
curses.initsrc(), the width is saved in a global variable.
It should not change the line buffering of stdout, but still
seems to do it on my terminal/curses/python combination for
the output of "bzr log ..."

Robert

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