Issue #34: added filter icon in the column headers
Issue #34: Added screen to select values to filter
Issue #34: Use the column filters in the table export query
Issue #34: filter modifications:

In the header, show the right icon whether the column is filtered or not.
Only allow filtering certain columns
Issue #34: Refresh the log view after changing the filter settings.
Issue #34: in the screen to filter on a column, show how many rows match each value
Issue #34: Allow filtering on "empty" values
Issue #34: Add menu item to clear filters
Issue #34: Use filters for KML export
Issue #34: When showing the possible values to filter, only show the available values given the existing filters on other columns
Issue #34: html header cleanup:

Make the headers bold again.
Make the filter icon easier to click on.
Wrap header labels.
Issue #34: Make filtered headers italic.
Issue #34: Translate filter strings into French and Spanish.
Issue #34: Minor html layout fix.
Issue #34: Add a hint text to the screen to filter column values.
Issue #34: Add confirmation dialog before deleting filters.
Issue #34: Cleanup and document
Issue #34: UCDetector
Issue #34: Remove deprecated SQLiteQueryBuilder method call