exact floppy timing fix

One-Filed version of 'Speed' trackmo by Sim Prod.
AGA support, but no speed fix for 68020+
need to watch this demo from HardDisk :
- OCS 512 kb Chip + 512 kb fake fast + 4 Mb Fast
- ECS 1 Mb Chip + 4 Mb Fast
- AGA 2 Mb Chip + 4 Mb Fast

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic]              2020944 3605408  56.1% -lh5- 105b Oct 31  1980 SpeedOneFiled
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         1 file  2020944 3605408  56.1%            Nov  1 20:25