barchart example fixed


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1-multiaxes@1803 29e17f8d-cf37-471e-a288-72cc03a76eda
QwtPlot::Axis moved to QwtAxis::Position


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1-multiaxes@1804 29e17f8d-cf37-471e-a288-72cc03a76eda
QwtAxis extended


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1-multiaxes@1805 29e17f8d-cf37-471e-a288-72cc03a76eda