[MERGE] contrib/bash/.bzrbashprompt.sh shows you branch nick/revno in your bash prompt

[Alexander Belchenko]

This patch was created by Vitaly Chernooky. He is not subscribed
to bzr ML so he asked me to send this.

This patch provides script for bash that allows you to see branch nick/revno
in bash prompt. He found such modified prompt very useful to work with looms.

Please CC your replies to him.

bb:comment I don't test this patch for obvious reasons so don't count this mail as approve vote.
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