add news item for ikiwiki 2.31

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+ikiwiki 2.31 released with [[toggle text="these changes"]]
+[[toggleable text="""
+ * [ Joey Hess ]
+   * Revert preservation of input file modification times in output files,
+     since this leads to too many problems with web caching, especially with
+     inlined pages. Properly solving this would involve tracking every page
+     that contributes to a page's content and using the youngest of them all,
+     as well as special cases for things like the version plugin, and it's just
+     too complex to do.
+   * aggregate: Forking a child broke the one state that mattered: Forcing
+     the aggregating page to be rebuilt. Fix this.
+   * cgi hooks are now run before ikiwiki state is loaded.
+   * This allows locking the wiki before loading state, which avoids some
+     tricky locking code when saving a web edit.
+   * poll: This plugin turns out to have edited pages w/o doing any locking.
+     Oops. Convert it from a cgi to a sessioncgi hook, which will work
+     much better.
+   * recentchanges: Improve handling of links on the very static changes pages
+     by thunking to the CGI, which can redirect to the page, or allow it to be
+     created if it doesn't exist.
+   * recentchanges: Exipre all *.\_change pages, even if the directory
+     they're in has changed.
+   * aggregate: Lots of changes; aggregation can now run without locking the
+     wiki, and there is a separate aggregatelock to prevent multiple concurrent
+     aggregation runs.
+   * monotone changes by Brian May:
+     - On commits, replace "mtn sync" bidirectional with "mtn push" single
+       direction. No need to pull changes when doing a commit. mtn sync
+       is still called in rcs\_update.
+     - Support for viewing differences via patches using viewmtn.
+   * inline: When previewing, still call will\_render on rss/atom files,
+     just avoid actually writing the files. This is necessary because ikiwiki
+     saves state after a preview (in case it actually *did* write files),
+     and if will\_render isn't called its security checks will get upset
+     when the page is saved. Thanks to Edward Betts for his help tracking this
+     tricky bug down.
+   * inline: Add new `allowrss` and `allowatom` config options. These can be
+     used if you want a wiki that doesn't default to generating rss or atom
+     feeds, but that does allow them to be turned on for specific blogs.
+   * Don't die if running with --getctime and rcs\_getctime throws an error.
+     There are several cases (recentchanges files, aggregated files)
+     where some source files are not in revision control.
+   * Page templates can now use CTIME to show when the page was created.
+ * [ Josh Triplett ]
+   * README.Debian: Mention user wikilists."""]]
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