The "dhcp" command now accepts a list of interfaces to try until one
succeeds.  For example:

 iPXE> dhcp net0 net1 net2

If no interfaces are specified, all interfaces will be tried.

Note that interfaces that fail to DHCP are closed in order to avoid
memory exhaustion.  This behavior differs from the previous "dhcp"
command implementation but should not affect any existing scripts
since a "dhcp" command failure would in any case cause the script to
abort.

Originally-implemented-by: Lars Kellogg-Stedman <lars@oddbit.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

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resources has been revoked by the registrant of the domain.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>

Add FILE_LICENCE declarations to almost all files that make up the
various standard builds of gPXE.

Various combinations of options 43.6, 43.7 and 43.8 dictate which
servers we send Boot Server Discovery requests to, and which servers
we should accept responses from.  Obey these options, and remove the
explicit specification of a single Boot Server from start_pxebs() and
dependent functions.

The DHCP client code now implements only the mechanism of the DHCP and
PXE Boot Server protocols.  Boot Server Discovery can be initiated
manually using the "pxebs" command.  The menuing code is separated out
into a user-level function on a par with boot_root_path(), and is
entered in preference to a normal filename boot if the DHCP vendor
class is "PXEClient" and the PXE boot menu option exists.

can't modify it).