add news item for ikiwiki 2.9

diff --git a/doc/news/version_2.6.1.mdwn b/doc/news/version_2.6.1.mdwn
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-ikiwiki 2.6.1 released with [[toggle text="these changes"]]
-[[toggleable text="""
-   * Ye olde brown paper bag.
-   * Fix minor bug when blogging by cgi, introduced in last version.
-   * Fix a bug in unlockwiki intorduced last version that made it crash ikiwiki
-     if it wasn't locked when called. This is known to break post-commit
-     emails."""]]

diff --git a/doc/news/version_2.9.mdwn b/doc/news/version_2.9.mdwn
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+News for ikiwiki 2.9:
+
+   Since ikiwiki 2.0 was released, some limitiations have been added to what
+   ikiwiki considers a WikiLink. In short, if there are any spaces in between
+   the brackets, ikiwiki no longer considers it to be a WikiLink. If your wiki
+   contains things meant to be WikiLinks that contain spaces, you will need to
+   fix them, by replacing the spaces with underscores.
+   WikiLink have always been documented to not contain spaces, but bugs in
+   ikiwiki made it treat some text with spaces as WikiLinks. Most of these
+   bugs were fixed in version 2.2, and a final bug was fixed in this 2.9
+   release. These fixes are necessary to avoid ambiguity between
+   WikiLinks and PreProcessorDirectives. Apologies for any inconvenience
+   these bugs (and their fixes) may have caused.
+
+ikiwiki 2.9 released with [[toggle text="these changes"]]
+[[toggleable text="""
+   * Fix copyright and licence styling.
+   * tag: Add taglink preprocessor directive, supporting visible tag links.
+     Closes: #[443344](http://bugs.debian.org/443344)
+   * map: Fully specify paths to links to avoid issues when the bestlink
+     didn't point to the correct page.
+   * map: Render pages on the way to subpages whose parent pages
+     are not included in the map. Include special styling for such pages.
+   * map: Remove common prefixes and don't over-indent.
+   * Add class option to htmllink().
+   * img: Allow link=somepage to cause the image to link to a given page.
+     Slight overriding of link, as link=no is still used to disable the linking
+     entirely. Unless you have a page named "no"..
+   * Save index after previewing page edit, since even previewing can create
+     files in some situations, and this is appropriate in some cases, such as
+     the teximg plugin's error log file.
+     Such files will be automatically cleaned up at an appopriate later time.
+   * Don't allow whitespace in link text in a wikilink. This was still
+     allowed by the regexp in one case though not documented to work, and
+     was ambiguous with preprocessor directives.
+   * camelcase: Tighten regexp to avoid false positives. WikiWords are only
+     linkified now if they are preceeded by whitespace."""]]
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