Log Message:
Updated viewvc to 1.1.26.

Version 1.1.26 (released 24-Jan-2017)

  * security fix: escape nav_data name to avoid XSS attack

Version 1.1.25 (released 15-Sep-2016)

  * fix _rev2optrev assertion on long input

Version 1.1.24 (released 02-Oct-2015)

  * fix minor bug in human_readable boolean calculation
  * allow hr_funout option to apply to unidiff diffs, too
  * fix infinite loop in rcsparse
  * fix iso8601 timezone offset handling (issue #542)
  * add support for renamed roots (issue #544)
  * fix minor buglet in viewvc-install error message