Yorick routines defined in file gadget.i

C	+++		_grid_read		gadgetcenter		readTimings
	CHalo		_grid_write		grid_read		read_halo_tree
G	+++		_rotate		grid_write	S	+++
	GadgetSnapshot	C	+++	H	+++		showgal
_	+++		checksim		hydra_read		showhaloenv
	_gadget_read	G	+++	I	+++		showsim
	_gadget_write		gadget_merge		is_real		showxyz
	_grid_new		gadget_read	R	+++		+++
	_grid_open		gadget_write		readSnapTimings		+++