Bug 35100: Various fixes

Bug 35100: Various fixes

1) Don't automagically always set a transfer to in transit on checkin..
   wait for the user to actually confirm that's the case
2) New transfers triggered by a hold should take precidence, so hide
   transfers for any other reason from display
3) Update get_transfer and get_transfers to ensure ordering isn't lost
   when prefetch is used and add tests for this

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>