Allow LCD Menu to adjust Junction Deviation lower than .01.   Some machines currently have a JUNCTION_DEVIATION_MM value as low as .005 mm.     In the case of non-Linear-Advance machines...   The upper limit is raised to .5 mm.

Probably more thought needs to be given to the Linear Advance case.   It maybe it doesn't need a special case and should just use the same bounds as the non-Linear Advance case.