FDC DOR handler now does a sanity check when setting drive select, fixes OS/2 Setup fataling the emulator when reading Disk 2;

FDC SEEK command now no longer incorrectly times out when seeking to the track the FDC thinks it's already at, fixes floppies in NT 3.1;
Emulator now correctly saves configuration changes to the configuration files it was loaded with rather than always the default;
Default path for NVR's can now be overridden by adding the nvr_path option to the cfg file.

src/disc.c

@@ -183,6 +183,12 @@ double disc_real_period()
 
 void disc_poll()
 {
+	if (disc_drivesel > 1)
+	{
+		disc_poll_time += (int64_t) (32.0 * TIMER_USEC);
+		return;
+	}
+
         disc_poll_time += (int64_t) disc_real_period();
 
         if (drives[disc_drivesel].poll)