Use greater than or equal with total number of contributions

In previous version, authors selected when their total number
of contributions matched exactly the value of a category. In
this corrected version, authors are selected when their total
number of contributions is greater than or equal to the value
of a category. As a result, authors with multiple contributions
will now be listed in more than one category.
Add SQL query to export contribution type categories

The contribution type is a value computed for each participation
of an author by concatenating the AR, WG, role, institution+country,
and the number of participations with such a code for the author.