Log Message:
Update to 0.56.2
  pkg_src_summary:
    - Mysterious infinite loop was fixed in 'pkg_src_summary -m'
    - summary2multi_variants script was separated from pkg_src_summary
  pkg_bin_summary:
    - CKSUM was renamed to FILE_CKSUM (by analogy with FILE_SIZE
      and FILE_NAME) as suggested by spz@