no qFuzzyCompare for 0.0 for controls with very small step sizes. 
don't map very small values to "0.0" in QwtAbstractScaleDraw::label()


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1@1759 29e17f8d-cf37-471e-a288-72cc03a76eda
handling of NaN values in CONREC


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1@1762 29e17f8d-cf37-471e-a288-72cc03a76eda
QWT_VER_PAT incremented


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1@1764 29e17f8d-cf37-471e-a288-72cc03a76eda