version 0.5: lightweight tokenizer extracted from SxPipe included (you invoke it by calling 'MElt -t'); the main MElt bash script now outputs a Usage string when invoked with the '-h' option; make distcheck passed

git-svn-id: https://scm.gforge.inria.fr/authscm/cfourrie/svn/lingwb/MElt/trunk@2916 dc05b511-7f1d-0410-9f1c-d6f32a2df9e4