Fixed a bug where the user's list was downloaded but not saved afterward.

git-svn-id: http://taiga.googlecode.com/svn/trunk@255 77add795-4bdf-f0f6-a574-f4d068491005
Added a new dialog that displays changelogs of updates.

git-svn-id: http://taiga.googlecode.com/svn/trunk@256 77add795-4bdf-f0f6-a574-f4d068491005