Give solver parameters as argument when defining solver type with IterativeSolvers

[lijas]

It would be nice to be able to give solver parameters as arguments when defining the solver type. Currently I think one has to give the solver parameters as keywordargument to the solve function.

A = rand(10,10)
b = rand(10)

prob = LinearProblem(A,b)

solver = IterativeSolversJL_CG(maxiters=100) #This currently works
LinearSolve.solve(prob, solver) #..but this throws an error because maxiters is not a valid keyword argument for Iterativesolvers.cg

Note that if I change the keyword argument maxiters for IterativeSolversJL_CG() to maxiter (remove the s), it works.