viewvc: update from 1.1.18 to 1.1.21

[reedloden]

New upstream release.

Version 1.1.21 (released 13-Sep-2013)

• fix markup/annotate exception with Python < 2.7 (issue #527)

Version 1.1.20 (released 24-Apr-2013)

• fix tab-to-space handling regression in markup view
• fix regression in root lookup handling (issue #526)

Version 1.1.19 (released 22-Apr-2013)

• improve root lookup performance (issue #523)
• new 'max_filesize_kbytes' config option and handling (issue #524)
• tarball generation improvements:
  • preserve Subversion symlinks in generated tarballs (issue #487)
  • reduce memory usage of tarball generation logic
  • fix double compression of generated tarballs (issue #525)
• file content handling improvements:
  • expanded support for encoding detection and transcoding (issue package: openvpn; typo in specs/openvpn/openvpn-initscript.patch #11)
  • fix tab-to-space conversion bugs in markup, annotate, and diff views
  • fix handling of trailing whitespace in diff view
• add support for timestamp display in ISO8601 format (issue package: bump icinga.spec to 1.5.0 #46)