updated output files of all test scripts after upgrading R and several R packages: some start-up messages have changed; a few estimates have negligibly changed; some (co)variances and hence, standard errors have changed; ...

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/frontier@1440 bfa1024f-619b-4c99-bedc-c79f27261e5f
added function resettestFrontier() that applies Ramsey's RESET test to stochastic frontier models; mentioned this in the NEWS file

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/frontier@1441 bfa1024f-619b-4c99-bedc-c79f27261e5f
added tests for function resettestFrontier()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/frontier@1442 bfa1024f-619b-4c99-bedc-c79f27261e5f