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/cpu/cpu_table.c

@@ -60,6 +60,7 @@ CPU cpus_8088[] = {
     {"8088/12",      CPU_8088,  3, 12000000,    1, 0, 0, 0, 0, 0, 0,0,0,0, 1},
     {"8088/16",      CPU_8088,  4, 16000000,    1, 0, 0, 0, 0, 0, 0,0,0,0, 1},
 #endif
+    {"286/6",        CPU_286,   0,  6000000,    1, 0, 0, 0, 0, 0, 2,2,2,2, 1},
     {"",             -1,        0, 0,           0, 0, 0, 0, 0, 0, 0,0,0,0}
 };