Fixed bug in gnuplot labeling code

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/labeling@12 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Updated minor version number to reflect bug fix

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/labeling@13 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Decided on a different minor version bump

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/labeling@14 edb9625f-4e0d-4859-8d74-9fd3b1da38cb