require that we use drive 0x80, so it should probably be the default.

out-of-tree driver code.

to generate the initial transmission; this cuts off around 0.3s per
instantiated connection.

No Microsoft intellectual property was harmed in the production of
this code.

executing any image, not just a script.  (This will enable pxelinux to
use relative URIs, should it wish to.)

otherwise.  :(

Some shuffling around of the image management code; this needs tidying up.

list.

Added FEATURE() macros to most relevant (non-driver) files.

and generate DHCP options to indicate features to DHCP server (and to
PXE NBPs).

options are in main makefile now

Print error status using strerror().