Log Message:
Update to version 1.9.1

Changes since 1.9.0:

- Summary report bar colors can now be specified with
  color.summary.bar and col  or.summary.background configuration
  variables.
- The 'edit' command now conveniently fills in the current  date for
  new annotations.
- Deleting a task no longer clobbers any recorded end date (thanks to
  Seneca Cunningham).
- The following holidays are now computed automatically and can be
  used in the definitions for the calendar holidays: Good Friday
  (goodfriday), Easter (easter), Easter monday (eastermonday),
  Ascension (ascension), Pentecost (pentecost). The date is configured
  with the given keyword.
- The configure script is more portable (thanks to Emil Sköldberg).
- Updated task-faq.5 man page.
- Fixed bug #382 in which the annotate command didn't return an error
  message when called without an ID.
- Fixed bug #402 which failed compilation on Arch Linux (thanks to
  Johannes Schlatow).
- Fixed bug #401 that ignored the search.case.sensitive configuration
  setting when filtering on project names (thanks to John Florian).
- Fixed bug #395 that prevented the upgrade of a pending task to a
  recurring task (thanks to T. Charles Yun).