Wrong distribution in rotational diffusion?

[mastrof]

MicrobeAgents.jl/src/rotations.jl

Lines 17 to 25 in ac69dc8

	function rotational_diffusion!(microbe::AbstractMicrobe, model)
	dt = model.timestep
	D_rot = rotational_diffusivity(microbe)
	σ = sqrt(2*D_rot*dt)
	θ = rand(abmrng(model), Normal(0,σ))
	ϕ = rand(abmrng(model), Arccos())
	microbe.vel = rotate(direction(microbe), θ, ϕ)
	nothing
	end

It probably needs to use the new Isotropic distribution

[mastrof]

Actually the correct choice in 3D should be Uniform(-π,π). Dispatch can be implemented so that in 2D only θ is sampled since the second angle is not required.