[Review] Request from 'greygoo' @ 'SUSE/machinery/review_140919_add_system_description_documentation_link_to_man_page'

Please review the following changes:
  * 26fb1e6 Add a link pointing to the system description format documentation to the man page.
  * a6b08ff Merge pull request #244 from SUSE/review_140919_fix_missing_line_break_between_missing_and_additional_file_errors
  * cb458ca Fix missing line break between missing and additional file errors