Added color warning when a tank is low or nearly empty.
Now it only updates the lists when the part count changes, instead of clearing them and starting over.
It now checks the type of resource to disallow transfering solid rocket fuel around.
Merged in BloodyRain2k's changes.

(remote-tracking branch 'remotes/BloodyRain2k/master'
Conflicts: TacFuelBalancer/TacFuelBalancer.cs)
It now shows which stage each part is in.
broken now?