Fix and improve documentation, suggest tm.lexicon.GeneralInquirer


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tm@1365 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Support to set a named list as meta in PlainTextDocument and XMLTextDocument


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tm@1366 edb9625f-4e0d-4859-8d74-9fd3b1da38cb