v3.19

Release Notes:

• Amiga, ADF: Fix X-Copy verified writes with out-of-order sectors
  • Remember the latest written sector order for current cylinder
  • Forgotten after head step or disk eject but sufficient for X-Copy
• FF.CFG: New interface= options jppc and jppc-hdout
  • jppc: pin2=nc, pin34=RDY, Japanese PC standard
  • jppc-hdout: As above but pin2=HD_OUT, similar to ibmpc-hdout
  • akai-s950 is retained as a legacy alias for jppc-hdout