add news item for ikiwiki 2.16

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+News for ikiwiki 2.16:
+
+   Many of the pages in ikiwiki's basewiki have been moved and renamed in this
+   release, to avoid the basewiki including pages with names like "blog".
+   Redirection pages have been left behind for these moved pages temporarily,
+   and will be removed later.
+   The meta plugin no longer supports setting internal or external links
+   with "meta link". Instead, use "meta openid" for openid links, and use tags
+   for in-wiki invisible links between pages.
+   If you use the calendar plugin, ikiwiki is now smarter and your nightly
+   cron job to update the wiki doesn't need to rebuild everything. Just pass
+   --refresh to ikiwiki in the cron job and it will update only pages that
+   contain out of date calendars.
+
+ikiwiki 2.16 released with [[toggle text="these changes"]]
+[[toggleable text="""
+   * Major basewiki reorganisation. Most pages moved into ikiwiki/ subdirectory
+     to avoid polluting the main namespace, and some were further renamed.
+   * meta: Add redir support, based on a patch by Thomas Schwinge.
+   * Redirs added for moved basewiki pages. These will be removed in a future
+     release.
+   * Remove .otl file from sandbox to avoid build ugliness. Closes: #[454181](http://bugs.debian.org/454181)
+   * Finally implemented a simple per-page data storage mechanism for plugins,
+     via the %pagestate hash.
+   * Use pagestate in meta to detect potential redir loops.
+   * Added a version plugin that saves state about what's using it, to force
+     pages to rebuild when ikiwiki's version changes.
+   * The calendar plugin stores state about when it needs to be updated,
+     and forces rebuilds of the pages that contain calendars. So
+     running ikiwiki --refresh at midnight is now enough, no need for a full
+     wiki rebuild each midnight.
+   * calendar: Work around block html parsing bug in markdown 1.0.1 by
+     enclosing the calendar in an extra div.
+   * Fix file pruning code to work if ikiwiki is run with "." as the srcdir.
+   * Add an edittemplate plugin, allowing registering template pages, that
+     provide default content for new pages created using the web frontend.
+   * Change formbuilder hook to not be responsible for displaying a form,
+     so that more than one plugin can use this hook.
+     I believe this is a safe change, since only passwordauth uses this hook.
+     (If some other plugin already used it, it would have broken passwordauth!)
+   * Ensure that web edited pages always end in a newline.
+   * Avoid unnecessary stat calls to get mtime when rendering pages, use
+     cached value.
+   * Preserve input file modification times in output files.
+   * Allow dashes in preprocessor directive commands, and shortcuts.
+   * Htmlize parameters passed to the template preprocessor directive before
+     inserting them into the html template. This ensures that markdown
+     acts on them, even if the value is expanded inside a block-level html
+     element in the html template. Closes: #[454058](http://bugs.debian.org/454058)
+   * Use a div in the note template rather than a span.
+   * shortcut: Expand %S to the raw input text, not url-encoded.
+   * Don't increment feed numbers when an inline has no feeds. (Nis Martensen)
+   * Allow editing a page and deleting all content, while still disallowing
+     creating a new page that's entirely empty.
+   * meta: Drop support for "meta link", since supporting this for internal
+     links required meta to be run during scan, which complicated its data
+     storage, since it had to clear data stored during the scan pass to avoid
+     duplicating it during the normal preprocessing pass.
+   * If you used "meta link", you should switch to either "meta openid" (for
+     openid delegations), or tags (for internal, invisible links). I assume
+     that nobody really used "meta link" for external, non-openid links, since
+     the htmlscrubber ate those. (Tell me differently and I'll consider bringing
+     back that support.)
+   * meta: Improved data storage.
+   * meta: Drop the hackish filter hook that was used to clear
+     stored data before preprocessing, this hack was ugly, and broken (cf:
+     liw's disappearing openids).
+   * aggregate: Convert filter hook to a needsbuild hook.
+   * map: Don't inline images.
+   * brokenlinks: Don't list the same link multiple times. (%links might
+     contain multiple copies of the same link)
+   * git: Correct display of multiline commit messages in recentchanges.
+   * Re-organise dependencies and recommends now that recommends are installed
+     by default.
+   * Don't refuse to render files with ".." in their name. (Anchor the regexp.)
+   * Work around perl taint checking bug #411786, where perl sometimes randomly
+     sets the taint flag on untainted variables, by disabling taint checking
+     in the deb. This sucks."""]]
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