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/network/net_dp8390.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <wchar.h>
+#include <time.h>
+#define HAVE_STDARG_H
+
+/*
+ * Return the 6-bit index into the multicast
+ * table. Stolen unashamedly from FreeBSD's if_ed.c
+ */
+int
+mcast_index(const void *dst)
+{
+#define POLYNOMIAL 0x04c11db6
+    uint32_t crc = 0xffffffffL;
+    int carry, i, j;
+    uint8_t b;
+    uint8_t *ep = (uint8_t *)dst;
+
+    for (i=6; --i>=0;) {
+	b = *ep++;
+	for (j = 8; --j >= 0;) {
+		carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
+		crc <<= 1;
+		b >>= 1;
+		if (carry)
+			crc = ((crc ^ POLYNOMIAL) | carry);
+	}
+    }
+    return(crc >> 26);
+#undef POLYNOMIAL
+}