Save boot record before writing to the dest_drive

[James Courtier-Dutton]

Hi,

I think this would be a good feature, because if nothing else, I
permits the user to "uninstall grub" if they so wish.
So, if a user has installed Linux, so that their system now dual boots
Windows and Linux, and they then decide to uninstall Linux and return
to a Windows only setup.
It should be possible to return them to a setup that gets them
straight back into Windows, without any boot loader menus from grub.

Kind Regards

James