Several bug fixes and improvements:

    - fix layout updates after updating the config regression (topic 7739)
    - work around boost c++11 compile problem
    - fix cmake install prefix for wt_config.xml
    - fix regression caused by setting size when a scrollbar is present (which we don't understand really well)
    - more accurate handling of input/textarea elements in a layout manager
    - fixes for QNX: cleanup use of std:: namespace for libc functions
    - prevent propagation for menu
    - Dbo: added manual flushmode support
    - fix segfault in WTableView layoutChanged()