v0.12

Release Notes:

• GW Autodetect: General improvements, and now works on Windows 7
• New read parameter --double-step to double-step drive heads
  • Useful for reading a 40-cylinder disk in an 80-cylinder drive
• New 'pin' command allows a floppy pin to be set to specified level
  • Currently supported only for pin 2 (DENSEL)
• New 'reset' command resets the Greaseweazle to power-on settings
  • Motors off, drives deselected, power-on pin levels and delay values