templates/queries-correspondent-mysql.tpl.html,
templates/queries-correspondent-sqlite.tpl.html,
templates/queries-index-mysql.tpl.html,
templates/queries-index-sqlite.tpl.html: All SQL queries used a CASE
expression to return either 'Explicit' or 'Clean' depending on the
0/1 setting of the 'explicit' column. However, the TT² templates
using these queries were written to expect the numeric form. All the
'CASE' expressions have been replaced by the field name and now the
correct flag is being displayed.
