tp: better minimum spiral fit coefficient to reduce acceleration ripple on near-circular cases
tp: better minimum spiral fit coefficient to reduce acceleration ripple on near-circular cases

Signed-off-by: Robert W. Ellenberg <7cf60555c449d119e88c087cd5eb42ff6272cb3e@gmail.com>

ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror