create Hump class
add comments
add comments
create track class
remove ReceivingTrack to track
create classification area class
create coming train function
q
add some function about hump
add outboundArea and PullBack class
find the longest combine train at classification area
add ifBlockCombination function, to check for combination
modify combination function---findTrainCombine, change to longest first function which teacher said
release memory
modify combination function, index number modified
update time control
update time control
pull back set up and update time control
add ifPullBackPull variable
add OUTBOUND_TRAIN_INTERVAL