Fix the logic releted to ppmac InPos and group comments for turbo and ppmac

[UrszulaNeuman]

This pull request addresses the following problems:

1. On power pmac the group command was broken - it only worked when there was one motor in a group. This is now fixed so that both of the controllers use the same mechanism and the comments look correctly even when more motors are added to a group.
2. When the group didn't have any comment 'None' word was added to the comment without the comment operator (; for turbo or // for ppmac).
3. InPos condition on ppmac was wrong it used && instead of || to combine InPos status for motors in one group.