Refactor to clean up procedure, checking for infrastructure before pre-flight.  Correct problem with update of image name after svn update where new revision number was not used.  Remove need for curdur variable to switch back to previous directory.  Add check for kernel conf in confi dir and soft-link it into tree if need be.
Minor update: SOURCE_CHECKOUT var to display NO if not checking out.
Add kernel conf for IPFW.