the example for calculating inverse Mill's Ratios for bivariate probit models is run now (removed "\dontrun{}" command around this example)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sampleselection@1510 d36ae590-6c38-44c5-9ba5-7217e93607d8
added test script and corresponding output file for testing invMillsRatio() (exact copy of the example in the documentation of invMillsRatio() with one additional command: "option( digits = 3 )")

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sampleselection@1511 d36ae590-6c38-44c5-9ba5-7217e93607d8