Rewrote the way the suburls work to fix serious bug in it that revealed itself when I added robots.txt files.  Added robots.txt files.  Removed IHasSuburls dead chickens.
Patches applied:

 * steve.alexander@canonical.com/launchpad--devel--0--patch-107
   merge from rf

 * steve.alexander@canonical.com/launchpad--devel--0--patch-108
   Added robots.txt pages to root and applications.  Added configure.zcml in canonical/launchpad to hang launchpad config from.

 * steve.alexander@canonical.com/launchpad--devel--0--patch-109
   removed arch-tag from standard template

 * steve.alexander@canonical.com/launchpad--devel--0--patch-110
   re-added standard_template

 * steve.alexander@canonical.com/launchpad--devel--0--patch-111
   remove arch-tags from page templates that had them.

 * steve.alexander@canonical.com/launchpad--devel--0--patch-112
   merge from rf

 * steve.alexander@canonical.com/launchpad--devel--0--patch-113
   make pagetest maker preserve tmp directory if there is an error.

 * steve.alexander@canonical.com/launchpad--devel--0--patch-114
   rewrote the way the suburls work to fix serious bug in it that revealed itself when I added robots.txt files.  Added robots.txt files.

 * steve.alexander@canonical.com/launchpad--devel--0--patch-115
   merge from rocketfuel