timeline view minor enhancements * support dates < 1900 by using logilab.common.date.ustrftime * make the timeline a public member of the TimeLineWidget * let buildWidget return the created widget, so that we can manipulate it later

\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$