The new errdb error code database is more accurate than the regular
expression-based errcode scripts.  This patch removes errcode scripts
in favor of errdb.

The gpxebot.py script is no longer needed, gpxebot has been released
as a separate open source codebase:

  http://git.etherboot.org/?p=people/stefanha/gpxebot.git;a=summary

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.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resources has been revoked by the registrant of the domain.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>

Make sure parser doesn't choke on line with space at end.

Add a PHP script to act as a web interface for looking up error codes.