Small additions UI (for the wishlist)

[pd0psb]

- revert to .000 by pushing CLR+FINE, this simplifies coarse tuning on "round" kHz.
- for European XV transverter users: FM coarse steps 6,25 and 12,50 kHz (common rasters here for FM144/430)
- speed up tuning with factor x10(?) when spinning the VFO fast.

73'
Paul
PD0PSB