Add some error checking to optimiser to fix issues

[AlexCPU]

I've added a little bit of error handling to try and work out some of the issues I've been seeing.

For example I am consistently getting the error that the pool has too many crew, and it's always Niners Ezri, so a little more debug in assignCrewToPools which seems to give the below debug output implying it can't count properly, e.g. in this example pool.assignedCrew.length shows 11 with only 10 seats, however the debug view shows length 8.

Also, I'm always getting an error in sortCrewToTrain where highestContribingTrainee is blank.