add bacula hints

Signed-off-by: Martin Zobel-Helas <zobel@ftbfs.de>

diff --git a/input/howto/bacula-hints.mdwn b/input/howto/bacula-hints.mdwn
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+== useful bacula commands ==
+
+ * find out what was in a backup run
+   * get the job-id from the bacula mail
+   * run the following on bacula database (currently bmdb1.debian.org)
+```
+select path,name from filename inner join file on filename.filenameid=file.filenameid inner join path on path.pathid=file.pathid where file.jobid=$JOBID;
+```