The "Filters" button gives a list of filterable fields, and buttons to
select the type, including true/false, text match, and on/before/after a
date. When clicked, the appropriate values are put in the search box and
the cursor is placed if any input is needed.
Dates and strings are also now matched correctly, and case-insensitively when
deleting a filter.
Harvey Tindall
76bb95098c