update exemples using the 3.6 api and add/fix some sections (schema, vreg, talk about CW_MODE in concepts...). So much to do :'(

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