Revert "gmoccapy_0_9_9 - new DRO with new feature"

This reverts commit 6237ed6ee74ff0748fb65d31131f57f555a32e39.
gmoccapy_0_9_9 - new DRO with new features

ver. 0.9.9
- introduced a new DRO, showing all three positions (Abs, Rel, DTG) at ones
  user can toggle the DRO by clicking on them
- The new DRO also indicates the actual coordinate system
- The new DRO will change its units according to the active gcode (G20 / G21)
- There are still the three buttons, but they are hidden by default,
  this can be changed on the settings page, but when the buttons are vissible,
  the user looses the auto units feature of the DRO
  Hope too get the permission from the users to delete that button as soon as possible
- made the documentation for IconViewFileSelection
- made the documentation for Combi_DRO
- This change saved some lines of code in gmoccapy.py and made the code
  a lot easier to understand
- updated German translation
- updated Spanish translation
Merge remote-tracking branch 'origin/master' into unified-build-candidate-3