Added the 3Com 3C503 Network card;

Several bug fixes;
Preliminar addition of the SDL 2 renderer (does not yet work correctly in full screen mode);
SCSI devices no longer have configurable LUN's (this matches the configurability of real SCSI devices);
SCSI LUN's are now handed by the device's handler;
Removed all unused strings;
Removed some unused code files;
Significantly rewrote the bus mouse emulation.

src/intel_piix.c

@@ -10,7 +10,7 @@
  *		    word 0 - base address
  *		    word 1 - bits 1-15 = byte count, bit 31 = end of transfer
  *
- * Version:	@(#)intel_piix.c	1.0.16	2018/05/11
+ * Version:	@(#)intel_piix.c	1.0.17	2018/06/02
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -829,7 +829,7 @@ piix_reset(void *p)
     }
     for (i = 0; i < ZIP_NUM; i++) {
 	if (zip_drives[i].bus_type == ZIP_BUS_ATAPI)
-		zip_reset(i);
+		zip_reset(zip[i]);
     }
 }