add news item for ikiwiki 2.11

doc/news/version_2.11.mdwn

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+ikiwiki 2.11 released with [[toggle text="these changes"]]
+[[toggleable text="""
+   * Correct a pair of logic errors that triggered if svnpath was empty.
+   * If gitorigin\_branch is set to the empty string, don't push or pull.
+     Useful for laptop clones of remote wikis.
+   * Add a calendar plugin, contributed by Manoj Srivastava.
+   * Reformat calendar plugin to ikiwiki conventions.
+   * The calendar plugin made *every* page depend on every other page,
+     which seemed a wee tiny little bit overkill. Fixed the dependency
+     calculations (I hope.)
+   * Removed manual ctime statting code, and just have the calendar plugin use
+     %pagectime.
+   * Ikiwiki has moved into a git repository.
+   * postsparkline: Avoid a confusing error message if no pages match
+     and instead show an empty graph.
+   * Add handling of feeds for nested inlines, as well as support for a
+     single page containing two different feeds.
+   * Also fixed some places in inline that failed to use destpage correctly.
+   * ikiwiki-mass-rebuild: Patch from HenrikBrixAndersen to fix order
+     of permissions dropping code to work on FreeBSD.
+   * ikiwiki-mass-rebuild: Don't clear PATH from the environment.
+   * Run git-commit -q (though it doesn't do much good due to its stderr
+     abuse)."""]]