Rewrote the disc sector poller again for simplified code and more accuracy;

Floppy formats are now accurately timed and also more accurately implemented;
Applied all mainline PCem commits.

src/memregs.c

@@ -30,4 +30,4 @@ void memregs_init()
 	pclog("Memory Registers Init\n");
 
         io_sethandler(0x00e1, 0x0002, memregs_read, NULL, NULL, memregs_write, NULL, NULL,  NULL);
-}
+}