working on the sizeHints


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1-multiaxes@1812 29e17f8d-cf37-471e-a288-72cc03a76eda
working on the layout code


git-svn-id: svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1-multiaxes@1813 29e17f8d-cf37-471e-a288-72cc03a76eda