Several changes:

    - fix header container scrolling too far when contents container has a scrollbar (#2942)
    - fix regression in WTabWidget/layout interaction (#2809)
    - fix some build warnings
    - fix reconfiguring a spinbox (#2752)
    - fix WMenuItem::isChecked() in submenu's (#3018)
    - fix cross-browser regular expression flags
    - fix docroot error message
    - fix locating SSL: honoring SSL_PREFIX
    - bootstrap theme: fix setValidationState() bug
    - Drag&Drop: do not replace existing style classes during dragging
    - reorganized to have createRow, createColumn, createCell in WTable.
    - implemented on demand tooltip loading: setDeferredToolTip() + support in table views
    - also search for wttest (#2934)