New command ntldr and freedos

[Bean]

Hi,

The version r1812 adds command ntldr and freedos, which is used to
load ntldr/grldr/bootmgr and kernel.sys directly. For example:

# Load ntldr
set root=(hd0,1)
ntldr /ntldr

# Load grub4dos
set root=(hd0,1)
ntldr /grldr

# Load FreeDOS
set root=(hd0,1)
freedos /kernel.sys

--
Bean