[build] Rename gPXE to iPXE

Access to the gpxe.org and etherboot.org domains and associated
resources has been revoked by the registrant of the domain.  Work
around this problem by renaming project from gPXE to iPXE, and
updating URLs to match.

Also update README, LOG and COPYRIGHTS to remove obsolete information.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/sky2.c

@@ -1,5 +1,5 @@
 /*
- * gPXE driver for Marvell Yukon 2 chipset. Derived from Linux sky2 driver
+ * iPXE driver for Marvell Yukon 2 chipset. Derived from Linux sky2 driver
  * (v1.22), which was based on earlier sk98lin and skge drivers.
  *
  * This driver intentionally does not support all the features
@@ -8,7 +8,7 @@
  *
  * Copyright (C) 2005 Stephen Hemminger <shemminger@osdl.org>
  *
- * Modified for gPXE, April 2009 by Joshua Oreman
+ * Modified for iPXE, April 2009 by Joshua Oreman
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -30,11 +30,11 @@ FILE_LICENCE ( GPL2_ONLY );
 #include <errno.h>
 #include <stdio.h>
 #include <unistd.h>
-#include <gpxe/ethernet.h>
-#include <gpxe/if_ether.h>
-#include <gpxe/iobuf.h>
-#include <gpxe/malloc.h>
-#include <gpxe/pci.h>
+#include <ipxe/ethernet.h>
+#include <ipxe/if_ether.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/malloc.h>
+#include <ipxe/pci.h>
 #include <byteswap.h>
 #include <mii.h>
 
@@ -1016,7 +1016,7 @@ static struct io_buffer *sky2_rx_alloc(struct sky2_port *sky2)
 	 * Cards with a RAM buffer hang in the rx FIFO if the
 	 * receive buffer isn't aligned to (Linux module comments say
 	 * 64 bytes, Linux module code says 8 bytes). Since io_buffers
-	 * are always 2kb-aligned under gPXE, just leave it be
+	 * are always 2kb-aligned under iPXE, just leave it be
 	 * without ETH_DATA_ALIGN in those cases.
 	 *
 	 * XXX This causes unaligned access to the IP header,