Some improvements to the reinforcements behaviours:
* Add 'Furthest' option for choosing LZ's and RP's (usefull for having some units go to a forward LZ and some to a rear LZ)
* Fix bug where 'Nearest' LZ wasn't working right
* Try making cremembers more brave to see if that helps with not making it to LZ's under fire.
Fixed #51 - There was an issue where helicopters (and other vehicles) would wait around longer than intended after unloading troops.