more vsqbs sampler tweaks
more vsqbs sampler tweaks

jcupitt/libvips,leiyangyou/libvips,wishabi/libvips,jcupitt/libvips,leiyangyou/libvips,lovell/libvips,mcanthony/libvips,wishabi/libvips,mcanthony/libvips,jcupitt/libvips,lovell/libvips,mcanthony/libvips,lovell/libvips,leiyangyou/libvips,leiyangyou/libvips,mcanthony/libvips,wishabi/libvips,wishabi/libvips,jcupitt/libvips,lovell/libvips