* This removes the fVisibleToolTip member from BView, and fixes bug #5669;
BToolTipManager::ShowTip() now gets the owner of the tool tip as an extra
parameter.
* Removed the work-around to hide that bug.
* Improved ToolTipTest application to include more test cases like a view that
periodically update its tool tip via SetToolTip(const char*), and one that
sets a new tool tip every second.
* Furthermore, added a test that shows that inner views inherit the tool tip
of their parents.
* Fixed another bug in BToolTipManager::ShowTip() that would release an
extra reference to the tool tip currently shown.
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