Add required format field.

Add required format field at the begining of the document. Fields include:
Document number, Date, Project, Reply-to.
Added C++11 wording as delete.

Added C++11 section as delete. Marked new wording as insertion.
Changed the formating of INVOKE, cv, ref to be more consistent with
standard.
Changed viable references defintion wording.
Emphasize that implicit conversions are only allowed.