DD floppy drives now correctly ignore DENSEL when reading DD floppies;

Ne2000 now uses the correct vendor ID for the MAC address, per information from waltje;
File name text box in Add hard disk dialog is now correctly disabled;
Floppy drive types are now stored as readable string in the configuration file.

src/fdd.c

@@ -271,6 +271,11 @@ int fdd_is_525(int drive)
         return drive_types[fdd[drive].type].flags & FLAG_525;
 }
 
+int fdd_is_dd(int drive)
+{
+        return (drive_types[fdd[drive].type].flags & 0x70) == 0x10;
+}
+
 int fdd_is_ed(int drive)
 {
         return drive_types[fdd[drive].type].flags & FLAG_HOLE2;