Picasaweb plugin refreshed

Dear all digiKam fans and users!

The ui of the picasaweb exporter gains some love and is refreshed in current trunk. Its look now fits to other kipi export plugins with imagelistview support showing you the current processing element and a non-modal progressbar to let you work on your next photos while uploading.

Besides the exporter, a basic importer has been added, to let you download all your favourite albums.

Please check out current svn and tell any bugs at bugs.kde.org.