Help System
These classes provide for all forms of online-help in your application,
with three levels of detail:
    -  Tool Tips and Status Bar message - flyweight help, extremely brief,
        entirely integrated in the user interface, requiring little
        or no user interaction to invoke.
    
-  What's This? - lightweight, but can be
        a three-paragraph explanation.
    
-  Online Help - can encompass any amount of information,
        but is typically slower to call up, somewhat separated
        from the user's work, and often users feel that using online
        help is a digression from their real task.
Classes:
- QStatusBar
    (Horizontal bar suitable for presenting status information)
- QStyleSheet
    (A collection of styles for rich text rendering and a generator of tags)
- QTextBrowser
    (A rich text  browser with simple navigation)
- QTextView
    (A sophisticated single-page rich text viewer)
- QToolTip
    (Tool tips (sometimes called balloon help) for any widget or rectangular part of a widget)
- QToolTipGroup
    (Collects tool tips into natural groups)
- QWhatsThis
    (Simple description of any widget, e.g. answering the question "what's this?")
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