Added support for style of wiki table (i.e css style)

git-svn-id: https://svn.eiffel.com/eiffelstudio/trunk@95096 8089f293-4706-0410-a29e-feb5c42a2edf
Fixed compilation of WIKI_NULL_VISITOR due to the addition of new visiting procedures.

git-svn-id: https://svn.eiffel.com/eiffelstudio/trunk@95097 8089f293-4706-0410-a29e-feb5c42a2edf