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resources has been revoked by the registrant of the domain.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

contrib/errcode/gpxebot.py

@@ -20,11 +20,11 @@ import errcode
 
 HOST = 'irc.freenode.net'
 PORT = 6667
-NICK = 'gpxebot'
+NICK = 'ipxebot'
 CHAN = '#etherboot'
 NICKSERV_PASSWORD = None
-IDENT = 'gpxebot'
-REALNAME = 'gPXE bot'
+IDENT = 'ipxebot'
+REALNAME = 'iPXE bot'
 
 ERRCODE_RE = re.compile(r'(errcode|Error)\s+((0x)?[0-9a-fA-F]{8})')
 
@@ -59,7 +59,7 @@ def privmsg(_, target, msg):
         except ValueError:
             pass
     if msg.find('help') > -1:
-        pmsg(replyto, 'I look up gPXE error codes.  Message me like this:')
+        pmsg(replyto, 'I look up iPXE error codes.  Message me like this:')
         pmsg(replyto, 'errcode 0x12345678  OR  Error 0x12345678')
 
 def add_handler(command, handler, nargs):