missing first minor ticks fixed for certain logarithmic scales


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@2043 29e17f8d-cf37-471e-a288-72cc03a76eda
explicitely show legend widgets after creation to avoid potential
flickering


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@2044 29e17f8d-cf37-471e-a288-72cc03a76eda