Fix trajectories velocity calculation from Velocity mode

[LeandroMartinsdS]

This PR fixes the trajectories calculation from velocity mode.

• It considers the buffer rollover for the velocity mode needs information (position or time) from the previous or next buffer.
• Applies fixes in indexing for ppmac startAxisPointsCmd.
• Fixes typo M-variable definition in powerpmac motion program.
• Change the definition of the velocities to Q-variables in motion program.
• Fixes BufferAdr_B in ppmac motion