file security and bug fix update

[5.04-21]

• fix typographical error in changelog
  [5.04-20]
• fix #1037279 - better patch for the bug from previous release
  [5.04-19]
• fix #1037279 - display ‘from’ field on 32bit ppc core
  [5.04-18]
• fix #664513 - trim white-spaces during ISO9660 detection
  [5.04-17]
• fix CVE-2014-3479 (cdf_check_stream_offset boundary check)
• fix CVE-2014-3480 (cdf_count_chain insufficient boundary check)
• fix CVE-2014-0237 (cdf_unpack_summary_info() excessive looping DoS)
• fix CVE-2014-0238 (CDF property info parsing nelements infinite loop)
• fix CVE-2014-2270 (out-of-bounds access in search rules with offsets)
• fix CVE-2014-1943 (unrestricted recursion in handling of indirect type rules)
• fix CVE-2012-1571 (out of bounds read in CDF parser)
  [5.04-16]
• fix #873997 - improve Minix detection pattern to fix false positives
• fix #884396 - improve PBM pattern to fix misdetection with x86 boot sector
• fix #980941 - improve Bio-Rad pattern to fix false positives
• fix #849621 - tweak strength of XML, Latex and Python patterns to execute
  them in the proper order
• fix #1067771 - detect qcow version 3 images
• fix #1064463 - treat RRDTool files as binary files