[r=jamesh] Simple database restoration script and sampledata fixes
Patches applied:

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-15
   Add back dbrestore.py

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-16
   Attempt fix to broken text traceback page

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-17
   Work in progress

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-18
   Merge from Rocketfuel

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-19
   Remove dud entries from sampledata causing contraints to be switched off

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-20
   Database restore script

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-21
   Tweaks after tests with a production dump

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-22
   Make dbrestore.py silent unless in verbose mode

 * stuart.bishop@canonical.com/launchpad--dba--0--patch-23
   Incorporate reviewer comments