* Add small icon in cornerView of ArticleList for chosing visible columns.
Remove RSS icon methods.
Source code cleanup to conform to Vienna code style.
Localise the new Empty Trash warning dialog. We still need to run these files
past the localisers.
Add support for showing the Vienna app in the status bar. This includes a new
option in the General Preferences that defaults to off. An initial list of
menu commands is provided.

Note: the icon we should could probably be improved. It's just the generic
RSS icon right now and might well be confused with another status bar app that
also uses that icon.

Also, the GeneralPreferences strings files aren't updated yet. I'll do that as
a second submit because I somehow keep breaking the nib file.
Remove redundant SVN commit file that got submitted by mistake.
Update localization of GeneralPreferences.nib (DE).
Add 'Open Vienna' to the status bar menu. Show unread icon and count when there
are unread articles.
Update GeneralPreference strings to add "Show in menu bar". They're now ready
for localisation.
Check for nil URL when opening link from articles list. Example: the article Apple Statement in http://www.apple.com/main/rss/hotnews/hotnews.rss
Enable cancelling of active downloads.
Enable user-initiated refreshing of specific unsubscribed feeds as per forum and email discussion.
Remove redundant folders.
Add Basque (Euskara) localisation from Aitor Zubizarreta. Still a few missing
pieces to be completed.
New menu-item and context-menu item for downloading enclosures. Some localization tweaks.
Fix build warning due to missing definition.
Handle links to iTunes Music Store.
Send all non-handled URL schemes to NSWorkspace. This supercedes the previous commit.
Fix bugs with force refresh of unsubscribed feeds.
Fix bug that caused Vienna to hang on some web pages.