[LinuxCNC/linuxcnc Issue#612] 2.7->2.8: changing soft limits online does not work anymore

Maybe I need to update the kinematics during runtime somehow? This used to work fine.

Here are the steps I follow to reproduce the issue:

1. Create a config with ini.0.max_limit 500
2. Launch LinuxCNC, home axes, G0X500
3. Change limits during runtime. Execute setp ini.0.max_limit 1000 in shell or via custom subroutine.
4. G0X1000

This is what I expected to happen:

Should be able to jog up to the new extended limits.

This is what happened instead:

Old limits are still active, but hal config shows new value.

It worked properly before this:

That particular config worked fine with 2.7

Information about my hardware and software:

* I am running a binary I built myself
* I am using this LinuxCNC version: v2.8.0-pre1-3299-gefa9d09