
Specification of key scattering routines:
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low_n_evolve ( = tree_evolve, for now)

	input:	sdyn root pointer
		integration time
		output, snapshot intervals
		integration parameters (eps, eta, etc.)
		print interval	(default)
		print function	(default)

	output:	new sdyn root pointer

scatter3:

	input:	initial state structure
		output, snapshot, print intervals
		print function	(default)

	output:	intermediate state structure	(?problem with n_osc?)
		final state structure

sigma3:

	input:	target number of hits
		scatter profile structure
		debug flag
		scattering function (default)
		print function	(default)

	output:	scatter outcome structure
		
		
