* mkdebusbimg: many very very small changes in order to align it
    with my private version 
  * mkdebusbimg: comment changes only
  * mkdebusbimg: cosmetic changes to a couple of progress messages
  * mkdebusbimg: minor corrections to image size and partition sizes
  * mkdebusbimg: added 'set -e' to abort on error and GPL banner
  * mkdebusbimg: added many sanity checks
  * mkdebusbimg: renamed from mkusbimg to mkdebusbimg 
  * mkusbimg: added first version of script, taken from my article on web
  * mkusbimg: created module