TwoMotorMaster

Hi Sebastien and Matias I have written a new motor master for two motors and committed a TwoMotorMaster branch. Could you please finish this motor master with the new way of doing iterations and adapt the undershoot calculation to the style you prefer. It would be nice to add at the same time a two motor master for software triggered continuous scans to be coherent.

note: to be used for helicoidal tomo soft synchronized ?

Regards Jens