kickoff tabbar touch-ups

[M. Mehdi Salem Naraghi]

There is still this little border at the top of the tabbar that becomes 
visible because of the painter.translate(0.5, 0.5) instruction at line 
229 of tabbar.cpp. drawing a line with palette().base() as color before 
translating would cover this up but is somewhat ugly. Maybe bearable as 
a temporary solution?
---------- to be inserted right after line 228 tabbar.cpp -------------

    painter.setPen(QPen(palette().base(), 1));
    painter.drawLine(rect().topLeft(), rect().topRight());

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 Any other suggestions?