* Add a calendar plugin, contributed by Manoj Srivastava.

* Reformat calendar plugin to ikiwiki conventions.
* The calendar plugin made *every* page depend on every other page,
  which seemed a wee tiny little bit overkill. Fixed the dependency
  calculations (I hope.)
* Removed manual ctime statting code, and just have the calendar plugin use
  %pagectime.

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+[[template id=plugin name=calendar author="[[ManojSrivastava]]"]]
+[[tag type/chrome]]
+
+This plugin displays a calendar, similar to the typical calendars shown on
+some blogs.
+
+# examples
+
+	\[[calendar ]]
+
+	\[[calendar type="month" pages="blog/* and !*/Discussion"]]
+
+	\[[calendar type="year" year="2005" pages="blog/* and !*/Discussion"]]
+
+This plugin is inspired by the calendar plugin for Blosxom, but
+derives no code from it. This plugin is essentially a fancy front end
+to archives of previous pages, usually used for blogs. It can produce
+a calendar for a given month, or a list of months for a given year.
+
+The tricky part of this is that while calendar defaults to showing the
+current day and month, ikiwiki is a wiki compiler, which only rebuilds
+pages if they have changed. So to keep the calendar up-to-date, wikis that
+include it need to be periodically rebuilt, typically by cron at midnight.
+
+The month format calendar simply links to any page posted on each
+day of the month. The year format calendar links to archive pages, with
+names like `archives/2007` (for all of 2007)  and `archives/2007/01`
+(for January, 2007). For this to work, you'll need to create these archive
+pages. They typically use [[inline]] to display or list pages created in
+the given time frame.
+
+## usage
+
+* `type` - Used to specify the type of calendar wanted. Can be one of
+  "month" or "year". The default is a month view calendar.
+* `pages` - Specifies the [[PageSpec]] of pages to link to from the
+  month calendar. Defaults to "*".
+* `archivebase` - Configures the base of the archives hierarchy. The
+  default is "archives". Note that this default can also be overridden
+  for the whole wiki by setting `archivebase` in ikiwiki's setup file.
+* `year` - The year for which the calendar is requested. Defaults to the
+  current year.
+* `month` - The numeric month for which the calendar is requested, in the
+  range 1..12. Used only for the month view calendar, and defaults to the
+  current month.
+* `week_start_day` - A number, in the range 0..6, which represents the day
+  of the week that the month calendar starts with. 0 is Sunday, 1 is Monday,
+  and so on. Defaults to 0, which is Sunday.
+* `months_per_row` - In the annual calendar, number of months to place in
+  each row. Defaults to 3.
+
+## CSS
+
+The output is liberally sprinkled with classes, for fine grained CSS
+customization.
+
+* `month-calendar` - The month calendar as a whole.
+* `month-calendar-head` - The head of the month calendar (ie,"March").
+* `month-calendar-day-head` - A column head in the month calendar (ie, a
+  day-of-week abbreviation).
+* `month-calendar-day-noday`, `month-calendar-day-link`, 
+  `month-calendar-day-nolink`, `month-calendar-day-future`,
+  `month-calendar-day-this-day` - The day squares on the month calendar,
+  for days that are not in the month (before or after the month itself), that
+  don't have links, that do have links, that are in the future, or are that
+  are the current day, respectively.
+* `Sunday`, `Monday`, `Tuesday`, ... - Each day square is also given a class
+  matching its  (localised) day of week, this can be used to highlight
+  weekends.
+* `year-calendar` - The year calendar as a whole.
+* `year-calendar-head` - The head of the year calendar (ie, "2007").
+* `year-calendar-subhead` - For example, "Months".
+* `year-calendar-month-link`, `year-calendar-month-nolink`,
+  `year-calendar-month-future`, `year-calendar-this-month` - The month
+  squares on the year calendar, for months with stories,
+  without, in the future, and currently selected, respectively.