[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resources has been revoked by the registrant of the domain.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/Makefile

@@ -93,22 +93,22 @@ INCDIRS		+= include .
 # Default build target: build the most common targets and print out a
 # helpfully suggestive message
 #
-all : bin/blib.a bin/gpxe.dsk bin/gpxe.iso bin/gpxe.usb bin/undionly.kpxe
+all : bin/blib.a bin/ipxe.dsk bin/ipxe.iso bin/ipxe.usb bin/undionly.kpxe
 	@$(ECHO) '==========================================================='
 	@$(ECHO)
 	@$(ECHO) 'To create a bootable floppy, type'
-	@$(ECHO) '    cat bin/gpxe.dsk > /dev/fd0'
+	@$(ECHO) '    cat bin/ipxe.dsk > /dev/fd0'
 	@$(ECHO) 'where /dev/fd0 is your floppy drive.  This will erase any'
 	@$(ECHO) 'data already on the disk.'
 	@$(ECHO)
 	@$(ECHO) 'To create a bootable USB key, type'
-	@$(ECHO) '    cat bin/gpxe.usb > /dev/sdX'
+	@$(ECHO) '    cat bin/ipxe.usb > /dev/sdX'
 	@$(ECHO) 'where /dev/sdX is your USB key, and is *not* a real hard'
 	@$(ECHO) 'disk on your system.  This will erase any data already on'
 	@$(ECHO) 'the USB key.'
 	@$(ECHO)
 	@$(ECHO) 'To create a bootable CD-ROM, burn the ISO image '
-	@$(ECHO) 'bin/gpxe.iso to a blank CD-ROM.'
+	@$(ECHO) 'bin/ipxe.iso to a blank CD-ROM.'
 	@$(ECHO)
 	@$(ECHO) 'These images contain drivers for all supported cards.  You'
 	@$(ECHO) 'can build more customised images, and ROM images, using'
@@ -140,7 +140,7 @@ CFLAGS		+= -DVERSION_MAJOR=$(VERSION_MAJOR) \
 		   -DVERSION_MINOR=$(VERSION_MINOR) \
 		   -DVERSION_PATCH=$(VERSION_PATCH) \
 		   -DVERSION=\"$(VERSION)\"
-IDENT		= '$(@F) $(VERSION) (GPL) etherboot.org'
+IDENT		= '$(@F) $(VERSION) (GPL) ipxe.org'
 version :
 	@$(ECHO) $(VERSION)