better msaasamples tracking


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1612 b412e182-2ed4-4078-95c4-27dc59f57fa9
allow more than 16 msaa sample positions


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1613 b412e182-2ed4-4078-95c4-27dc59f57fa9