Implement MENU SAVE, which allows the menu system to retain the
previous selection from one boot to another.  In the process, fix the
syslinux_setadv() function.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

cmdline.inc: Unbreak "make depend"
Makefile: fix "make spotless"

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

ipappend information is needed for the plain cmdline too, since it may
be used by linux.c32.  While we're at it, clean up the handling of
ipappend lines -- we can rather obviously use a loop for them.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add a MIME file for the LSS16 image format.  Currently only included
in source, as it is somewhat unclear what the proper way to package
this thing is.

Mark the memory range 0-0x7c00 unavailable until the new shuffler code
is ready, at which point we can go for a tighter bound.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Make the new MBR variants installables, and add to the NEWS file.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Fix build failure due to incorrect comment syntax in memdisk.ld

Produce MBR variants with normal (DL) behavior, force to drive 80
behavior, and force to 80 on Ctrl pressed behavior.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>