Would a default control function be worthwhile?

[TimTaylor]

I wonder if this should call a default_control() function. This may be a little more tractable/transparent?

finalsize/R/final_size.R

Lines 128 to 134 in e059839

	final_size <- function(r0 = 2.0,
	contact_matrix,
	demography_vector,
	p_susceptibility,
	susceptibility,
	solver = c("iterative", "newton"),
	control = list()) {

It could become something like

 final_size <- function(r0 = 2.0, 
                        contact_matrix, 
                        demography_vector, 
                        p_susceptibility, 
                        susceptibility, 
                        solver = c("iterative", "newton"), 
                        control = default_controls(solver)) { 

[pratikunterwegs]

I agree that control = list() is a bit opaque, and in general I am in favour of being upfront about default arguments. Now that the proposed function body in #73 has a default control list creation step, with user values overriding the defaults if passed, this may be a bit more transparent to users?