News Interceptor 3 Beta 10

We have added some minor features. New in the version :

- add: navigation pane now displays the number of unread news;
- add: progress bar to better see refresh status of the feeds;
- add: state of expanded categories are now saved in the navigation pane;
- add: saving news on disk after each refresh, so that nothing is lost if a problem occurs;
- fix: improvement for refreshing feeds.