QwtPlotAbstractBarChart::sampleWidth fixed for AutoAdjustSamples policy
using the layoutHint as minimum


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1-multiaxes@1992 29e17f8d-cf37-471e-a288-72cc03a76eda
handling of Qt::WA_UpdatesDisabled simplified


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1-multiaxes@1994 29e17f8d-cf37-471e-a288-72cc03a76eda