add news item for ikiwiki 2.2

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+ikiwiki 2.2 released with [[toggle text="these changes"]]
+[[toggleable text="""
+   * Change the aggregate plugin's locking strategy. Now it defers loading state
+     until the wiki is building and already locked, unless it's aggregating.
+     When aggregating, it does not wait for the lock if it cannot get it, and
+     instead exits, to prevent aggregating processes from piling up.
+   * Updated Spanish translation from Victor Moral.
+   * Correct bug in the img plugin that caused dependencies on images to not
+     always be tracked correctly.
+   * Deal better with rebuilds that involve moving files; track and clean up the
+     old files.
+   * Change where the img plugin puts scaled images. It's better to make the
+     scaled images subpages of the page that embeds them, rather than putting
+     them alongside the original image, since if two pages scale the same image
+     the same way, this prevents complications in dealing with two pages
+     creating the same file. The move will be handled transparently, though you
+     might want to rebuild your wiki to make it occur in one step.
+   * Fix FTBFS in test suite introduced in last version. Closes: #[425891](http://bugs.debian.org/425891)
+   * Apply a patch from Carl Worth allowing a class attribute to be passed
+     through the img plugin. Also allow the id attribute to be passed through.
+   * More consistent encoding of titles in rss and atom feeds. Don't use
+     ESCAPE=HTML for titles in the templates for these feeds, and instead
+     escape the title going in to the template. Previously, the title was
+     sometimes double-escaped in a feed (if set via meta title), and sometimes
+     not (if set from the page filename).
+   * In the meta plugin, when a title is set, encode the html entities in it
+     numerically. This works better in the current landscape of a rss spec that
+     doesn't specify encoding, and variously broken feed consumers, according
+     to <http://www.rssboard.org/rss-profile#data-types-characterdata>.
+   * Correct some issues with display of unhandled preprocessor directives.
+   * Apply a patch from Carl Worth adding support for using globs in link()
+     in a PageSpec.
+   * Explode some of the more insane regexps.
+   * Add test suite for preprocessor directive parsing.
+   * Fix wrapper generator and untaint code's handling of strings contining
+     newlines.
+   * Make the url absolution code for feeds significantly more robust.
+   * Add typographyattributes configuration setting to typography plugin."""]]
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