Starting on filtering

1. Added filtering controls (mostly inactive)
2. Added include filtering, is always applied
3. Tweaked container sizes and added initial select of the server
textbox
Better filtering

Enabled include or exclude depending on radio buttons; Filter checkbox
toggles whether or not to search
Added previous searches to combo box; toggle filter state
Enabled max article number

Also added more exception handling
Tweaks to split containers and listbox data sources