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/ibm.h

@@ -626,3 +626,8 @@ extern uint32_t eip_msr;
 extern uint64_t star;
 
 #define FPU_CW_Reserved_Bits (0xe0c0)
+
+extern char nvr_path[260];
+extern int path_len;
+
+char *nvr_concat(char *to_concat);