Fixed bugs new.pim.env and validObject
Added methods for nobs
Changed equal.lengths to equal.nobs
corrected new.pim.poset and pim.environment-class to work with the adaptations to new.pim.env 

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pim@54 edb9625f-4e0d-4859-8d74-9fd3b1da38cb