Formated xhtml based tables and lists produce newlines

The formating newlines between elements of the html tables actually produce newline events which does not make any sense between a table row and a table cell.

In practice this break the xwiki/2.1 serializer which put too many newlines and produce new table row instead of a new cell.

The bug is actually in Bliki but since all Bliki really cares about is producing html this bug actually ends up being a feature (keep the formating of the html table) so I will have to filter things like this on our side.

Created https://bitbucket.org/axelclk/info.bliki.wiki/issues/45.