bts-link git commit to 'rrd'

[Sandro Tosi]

New branch 'rrd' available with the following commits:
commit d23501992abfb1c26f27b13b6b4e2d70d333525d
Author: Sandro Tosi <morph at debian.org>
Date:   Fri Apr 8 21:02:51 2011 +0200

    first generation of rrd graphs from historical data