Need some improvements for Downloads Table:
1. column chooser. choosing columns need to work from popup menu, and may
be from windows when you can choose columns and apply changes (like
Amarok do).
2. header renderer need to show tooltip for better usability.
3. reimplemented sorter for Status column, to draw only one thing - or
icon or text.
4. make triple column sorter - sort forward, sort backward, unsort (like
NetBeans do).
5. make two types of filter - removing unsuitable objects of highlight
suitable (something between Amarok and JXTable).
6. table header borders need to be more pretty, default looks like motif.