5-axis kinematics B axis invert rotation

The vismach simulation is loaded with this line in '5axisgui.hal:

loadusr -W 5axisgui

If you comment that out like this:

#loadusr -W 5axisgui

it will no longer create the window with the machine simulation and also no longer create the pins that relate to it so you will also need to remove any of the '5axisgui.'-pin connections that are used by the simulation window.

I replaced
loadusr -W 5axisgui pivot-length [my_value]
with
setp 5axiskins.pivot-length [my_value]
so I can set it in hal or eventually I will move it in ini and call it from there, makes more sense for me.