make assignvslotlayers inline


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1742 b412e182-2ed4-4078-95c4-27dc59f57fa9
simplifying layer/decal packing


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1743 b412e182-2ed4-4078-95c4-27dc59f57fa9