Fire-beam

beam-fire
	Fire a beam weapon from a specified subsystem
	1:	Ship which will be firing
	2:	Turret which will fire the beam (note, this turret must have at least 1 beam  weapon on it)
	3:	Ship which will be targeted
Use add-data to add a specific subsystem to target on the specified target ship

Notes

This SEXP is used for scripted fights, such as the one involving the GVD Psamtik and the GTCv Belisarius in Surrender, Belisarius!.