Overview of changes in gcalctool 5.21.91

    * Change Help->Help menu to Help->Contents to match HIG (Bug #514812)

    * Fix for bug #515326 – translation issues

    * Unmark bitcalculating strings for translation (Bug #515326)
      Change help menu shortcut from Ctrl+H to F1 to match HIG (Bug #514812)

    * Remove help/it/Makefile, switching to gnome-doc-utils

    * Fix for bug #514233 - Title not translated

    * Fix for bug #513868 - Switching mode clears values but not
      "Malformed expression" in statusbar.

    * Fix for bug #513218 - Parsing not handling things the way a
      "normal" calculator would.

    * Fix for bug #482666 - XML errors in gcalctool de translation.

    * Fix typo (Retreive -> Retrieve)

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