Fixed handling of DMF IMG images;

Fixed 3.5" 2ED XDF structure;
Applied mainline PCem big recompiler speedup (up to 20% seen) commit;
Added support for floppy drive swapping with the Winbond W3877F Super I/O chip.

src/pc.c

@@ -245,8 +245,6 @@ void initpc(int argc, char *argv[])
         if (config_file)
                 saveconfig();
 
-        codegen_init();
-        
         cpuspeed2=(AT)?2:1;
 //        cpuspeed2=cpuspeed;
         atfullspeed=0;
@@ -256,6 +254,8 @@ void initpc(int argc, char *argv[])
         loadbios();
         mem_add_bios();
 
+        codegen_init();
+
         device_init();        
                        
         timer_reset();