Clean the building of TL, TC, T4 (they contain names and not numbers) and remove two bugs (building of TC and in [.ktab)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ade4@681 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Improve '[.ktab' and add '[.dudi': extraction methods allow to select rows and/or columns of dudi and ktab objects

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ade4@682 edb9625f-4e0d-4859-8d74-9fd3b1da38cb