Several changes:

    - fix old pango compilation problem (#3069)
    - Breaking symmetry in axis flaps, so they won't overlap
    - do partial update of layout config to keep e.g. scrollbar of existing items
    - WTemplate: added note on XSS filtering for bindString
    - Fix Empty WModelIndex data to boost::any()
    - Fix UK locale is en_GB, not en_UK
    - boost phoenix patch for boost 1.56
    - WCartesianChart clear areas when paint is called and not when paint event, to avoid memory problems for users that use paint and not paint event.