Works on mac. Single threaded. SpinOnce stays active beyond the time stated in the function call. On
On Ubuntu, SpinOnce() is only active for nb of ms stated in its first argument.
Merge with changes on the remote.

Merge branch 'master' of https://github.com/btj10/DIS_Kinect
register::run() on LINUX is threaded, on MAC it is not.
In both cases, use first presses Manual Registration, followed by ICP.
No longer any need to press stop Thread.