get_annulus_segments: optimization segment scaling
get_annulus_segments: optimization segment scaling

Allows simple scaling of the annulus segments, which then can be used as « optimization segments » (like LOCI, Lafrenière et al 2007). LOCI uses other (more) parameters for the scaling, but the resulting segment should have the same properties: same `inner_radius`, mean position and angular width, but greater width.

henry-ngo/VIP,carlgogo/vip_exoplanets,vortex-exoplanet/VIP