The new command prints arguments set in the image.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>

Given a partition size and start address, this will edit the image passed as parameter
to create a partition entry. This assumes the disk is always bigger than 8Gb while setting
the CHS address. From osdev wiki:

"For drives smaller than 8GB, the LBA fields and the CHS fields must "match"
 when the values are converted into the other format.  For drives bigger than
 8GB, generally the CHS fields are set to Cylinder = 1023, Head = 254 or 255,
 Sector = 63 -- which is considered an invalid setting."

It currently sits in the middle of the partition table. Move it to a safer
location.

Since we're packing the entire file system into the boot image, it has
overflowed the 128MB limit that was set for it.

Adjust the boot loader during build time to account for the actual loaded size.

Fixes wierd corruption during startup.

At present, a single command is available, "setargs".

   scripts/imgedit.py setargs /path/to/image arg0 arg1 arg2...

to set the boot arguments.