"flags that are currently being sent".  This allows at least one special
case (checking that we haven't already sent a FIN in tcp_rx_fin()) to be
collapsed.

TargetAddress from the login response, because we still need the old
address while we close the connection!

curses.h so that you don't have to suffer the curses namespace pollution
just to get the symbolic key names.

"boot" command to attempt booting from within the command shell, fall back
to shell if boot fails for any reason.

the option config UI.

Introduce new {show,set,clear}_setting() that take a struct setting *
rather than a const char *.

set_setting() handles calling clear_setting() when appropriate, so that
individual setting types don't have to check for empty strings.

command is linked in.

abstraction.

non-ANSI-capable consoles.

based on the device size.

of execl().

(which was extremely heavy on calls to malloc()).

Moved include/command.h to include/gpxe/command.h, since it's
gPXE-specific.

in our commands.