Proximity view layouts

Detailed Description

Variables
const layout_type_t	layout_none = 0
const layout_type_t	layout_digraph = 1
const layout_type_t	layout_tree = 2
const layout_type_t	layout_circle = 3
const layout_type_t	layout_polar_tree = 4
const layout_type_t	layout_orthogonal = 5
const layout_type_t	layout_radial_tree = 6