Loading these two XML files created a divelist with two trips that each
started at the same time but that were NOT linked together (because the
code in insert_trip detected that they started at the same time). Since
the trips were not linked together, trying to then merge those two trips
from the UI got us into an infinite loop, trying to move a dive from one
trip into the same trip (as the code couldn't find the trip that wasn't
linked into the dive_trip_list).
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
