updated output files of test scripts (many small usually negligible changes due to a different version of R, maxLik, Ubuntu?)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sampleselection@1610 d36ae590-6c38-44c5-9ba5-7217e93607d8
added test script and corresponding output file for commands that fail

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sampleselection@1611 d36ae590-6c38-44c5-9ba5-7217e93607d8
package 'plm' is now 'import'ed rather than 'suggest'ed, because function plm() is used to obtain starting vaules for censored panel data models; adjusted NAMESPACE file according to the notes returned by 'R CMD check'

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/sampleselection@1612 d36ae590-6c38-44c5-9ba5-7217e93607d8