Add options to select grouping criteria
Nest 'CSV Data' within section for 'Authors'
Add markup for stats and CSV export of selected categories
Simplify values of options for categories

I now expect to prepare a precomputed index for each category
in a separate property named after the radio button value.
Add suffix '_categories' to each radio button value for disambiguation
Rename 'data-output' element to 'selected-authors-csv-output'

The change differentiates this element from the element for the export
of CSV data of selected categories.
Add text inputs for all principle variables in filters section
Update filters: add filter on total number of contributions
Rename jsonp.js to authors.js
Rename button from 'See the selection' to 'Update the selection'

With the grouping options below the filters, the selection of
authors can no longer typically be seen in the same screen.
Update generated data: simplified author records

Data files for grouping criteria and lists of values will be
added separately.
Rename comparison operator 'EQ' to 'EQUALS'

This is the default value of data-operator annotations on our HTML
input elements.
Switch parameters of operators

The first parameter is now the filter or expected value while
the second parameter is the actual value or actual list of values.
Add comparison operator <= and >=
Switch parameters of comparison function back to actualValue, expectedValue

It appears more logical, as seen in the specification, to consider
comparison operators as applied to the actual values rather than the
reference values, for example, the total number of contributions
shall be greater than or equal to the given value; stated the other
way the sentence is obscure: the given value shall be lower than or
equal than the total number of contributions.
Rename operator "IN" to "CONTAINS" to reflect order of arguments
Add missing suffix '_categories' to first option
Update authors data

The data is now published in the property 'authors'.
A new column has been added for filter on chapters.
Rename property/event "data" to "authors"

The change is in line with the new name in generated data file.
Display percentage with more accuracy below 1%

Below 0.5%, the value used to be displayed as 0%,
which is perplexing although accurate.