suppress initial Mille binary output (does not contain useful info)

bug fix for dumping the millepede binary.
- the first instance is related to the GBL trackjectory without (!) global derivatives vital for millepede, it's used only to do the actual broken line fit. the second instance in the method dedicated for the binary output dumping uses the broken line track parameters to get global derivatives right (they can be track dependent -> z-shifts)

Millepede binary output method: 
- remove unused code
- add scatterers to the GLB trajectory