CURRIKI-6056 : PROJECT: Activate Wysiwyg 2.0 instead of TinyMCE

Curriki groups conversion to syntax xwiki/2.1, required only conversion
of template space, we can still use the xwiki/1.0 sheets.
Added #verbatim macros, that adds {pre} on xwiki/1.0 documents and
{{html}} in xwiki/2.0 and xwiki/2.1 documents.
Added also some wysiwyg editor macros to be used for ajax requests
wysiwyg loading.
Some javascript moved from inline to a js file.