Added a new column to the stats tables, "rawArea".

The new column shows how much area would be matched by each row
if no filters were being used. This allows the consumer to
calculate how much area matchews the query.
Not optimising output of category tabular data any more.

This allows the client to do more with the data, such as calculate
consistent totals.
Tabular data now includes raw area column.

This shows how much area is available if the data were unfiltered.

Merge branch 'feature-tabular-fractions' into akka-workers