#4 btmgr-4 Update sbminst to optionally use linux boot loader

[Jochen Hepp]

Patch 4 of 4 patches to btmgr-3.7-1:

Add functionality to sbminst to create smart boot manager images with the linux kernel boot loader (option '-l').

Add option '-f filename' to sbminst to write installed smart boot manager also to a file.

[Jochen Hepp]

Patch 4 of 4 patches to btmgr-3.7-1