test script: no longer setting class of returned object to NULL before print()ing it but using print.default()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/micecon@1948 95fa4d17-b1e8-0310-9d42-a43d67248e42
NEWS: mentioned that 'micEconAids' no longer depends on some packages but imports or suggests these packages

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/micecon@1949 95fa4d17-b1e8-0310-9d42-a43d67248e42
DESCRIPTION: increased patch level (the version number is 0.6-6 now) and updated date

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/micecon@1950 95fa4d17-b1e8-0310-9d42-a43d67248e42
DESCRIPTION: increased patch level (version number is 0.6-7 now) after uploading the package to CRAN; this avoids the problem of having two different versions (released version on CRAN and development version on R-Forge) with the same version number

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/micecon@1951 95fa4d17-b1e8-0310-9d42-a43d67248e42
updated output files of test scripts: some start-up messages have changed; many "white" differences

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/micecon@1952 95fa4d17-b1e8-0310-9d42-a43d67248e42
property changes made by RStudio

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/micecon@1953 95fa4d17-b1e8-0310-9d42-a43d67248e42