Minor changes to the LoadingBayViews display of LoadingInfos:
 -	Now, only the first subOrder on the trailer (aka. the one who has
	the earliest earliestTimeOfLoading, gets its state set to
	READY_TO_LOAD when the trailer arrives.
 -	Each time a LoadingInfos state is set to LOADED, the next subOrder
	sharing its trailer (if any) get its loadingInfos state set to
	READY_TO_LOAD.
 -	This somewhat overrides the check we made for this situation, by
	looking at Trailer state. This check will still be used if we need 	to
repack a trailer though.... 
 
 -	Updated NewSubOrderDialog, so it only displays trailers with the
	right productType, the needed free space AND trailers who haven't 	left
for Danish Crown yet (Aka. TrailerState = IDLE)
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