add news item for ikiwiki 3.1415926

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+News for ikiwiki 3.1415926:
+
+   In order to fix a performance bug, all wikis need to be rebuilt on
+   upgrade to this version. If you listed your wiki in
+   /etc/ikiwiki/wikilist this will be done automatically when the
+   Debian package is upgraded. Or use ikiwiki-mass-rebuild to force
+   a rebuild.
+
+ikiwiki 3.1415926 released with [[!toggle text="these changes"]]
+[[!toggleable text="""
+ * [ Joey Hess ]
+   * po: Detect if nowrapi18n can't be passed to po4a, and warn about
+     the old version, but continue. Closes: #[541205](http://bugs.debian.org/541205)
+   * inline: Avoid use of my $\_ as it fails with older perls.
+     Closes: #[541215](http://bugs.debian.org/541215)
+   * Add discussionpage configuration setting.
+   * Several optimisations, including speedups to orphans and brokenlinks
+     calculation.
+   * meta, img: Fix bugs in dependency code. (smcv)
+   * Allow building ikiwiki on systems w/o po4a --
+     building of the translated underlays will be skipped in this case.
+   * Add basic styling of po plugin's languages list.
+   * inline: Display an error if feedpages is specified and fails to match
+     due to a problem such as created\_before being told to check against
+     a page that does not exist.
+   * Remove deprecated ikiwiki/blog and ikiwiki/preprocessordirective
+     pages from the basewiki.
+   * Updated French program translation from Philippe Batailler.
+     Closes: #[542036](http://bugs.debian.org/542036)
+   * po: Fixed to run rcs\_add ralative to srcdir.
+   * Italian program translation from Luca Bruno.
+   * Fix example blog's tags/life to not have a broken PageSpec.
+     Closes: #[543510](http://bugs.debian.org/543510)
+   * Optimize the dependencies list. This also fixes a bug
+     that could cause repeated refreshes of the wiki to grow
+     increasingly larger dependency lists, and get increasingly
+     slower. (smcv)
+   * Rebuild wikis on upgrade to this version to fix bloat caused
+     by the dependency bug.
+   * Further optimisation of dependency handling by adding a special
+     case for simple page dependencies. (smcv)
+   * htmltidy: Return an error message if tidy fails. Closes: #[543722](http://bugs.debian.org/543722)
+   * po: Fix name of translated toplevel index page. (intrigeri)
+   * po: Fix display of links from a translated page to itself (ntrigeri)
+   * Add Czech basewiki translation from Miroslav Kure.
+   * po: fix interdiction to create pages of type po (intrigeri)
+   * po: po: favor the type of linking page's masterpage on page creation
+     (intrigeri)
+   * img: Don't generate new verison of image if it is scaled to be
+     larger in either dimension.
+ * [ Josh Triplett ]
+   * teximg: Replace the insufficient blacklist with the built-in security
+     mechanisms of TeX."""]]
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