unguarded QwtDll when building examples


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@1881 29e17f8d-cf37-471e-a288-72cc03a76eda
unguarded QwtDll


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@1882 29e17f8d-cf37-471e-a288-72cc03a76eda
range check fixed


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@1883 29e17f8d-cf37-471e-a288-72cc03a76eda
bounding rect fixed when having only one vertical bar


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@1885 29e17f8d-cf37-471e-a288-72cc03a76eda