Num-ships-in-battle

num-ships-in-battle
	Returns the number of ships in battle or the number of ships in battle out of a list of teams, wings, and ships.  Takes 1 or more arguments...
	(all):	Teams, Wings, and Ships to query (optional)

Notes

This SEXP can be used for one ship to check if its present and alive in the mission; or destroyed, departed, or vanished.