Add detection of bootloader installed in the MBR

[gert]

Add detection of bootloader installed in the MBR.
I think it is a nice feature and not difficult to implement.

boot_info_script does this:  http://sourceforge.net/projects/bootinfoscript/

Look at the first two bytes of the hard drive to identify the boot code installed in the MBR.

0000) BL="No boot loader"

0ebe) BL=ThinkPad
31c0) BL="Acer 3"
33c0) BL=Windows
33ff) BL='HP/Gateway'
b800) BL=Plop
ea1e) BL="Truecrypt Boot Loader"
eb04) BL=Solaris
eb48) BL=Grub
eb4c) BL=Grub2
eb5e) BL=Grub4Dos
fa31) BL="Master Boot LoaDeR"
fa31) BL=Syslinux

fa33) BL="No boot loader"
fab8) BL="No boot loader"
fabe) BL="No boot loader?"

faeb) BL=Lilo
fc31) BL=Testdisk
fc33) BL=Gag
fceb) BL="BootIT NG"

all other values) BL="No known boot loader"

[pierre]

Started a prototype in the bootloader-detection branch:

 http://git.zytor.com/?p=users/pam/hdt-pierre.git;a=shortlog;h=refs/heads/bootloader-detection

Build available at:

 http://pub.mouraf.org/syslinux/hdt/hdt-bootloader-detection.c32

[pierre]

Fixed in 0.3.5.