The order before used to be join time, first, last. Changed to
first, last, join time.
There is also an option to set the order to latest for the
groupmembers blockinstance (group home page). This will have
the order join, first, last.

Bug #707860

Change-Id: I41a4ff0b0bd340b5b736958925b8096232c08fbb
Signed-off-by: Hugh Davenport <hugh@catalyst.net.nz>