digiKam from trunk (KDE4) : add Multiple Roots Album Path on setup.

With new database interface implemented by Marcel, digiKam can use more than one root album path as collection of images.

digiKam database file is now stored in a customized place wich still in local and can be different than roots album.

This means that read only, remote repository, and disconnected repository are fully suported as well.

These collection types are able to use:

- Local drive.
- Remote drive (NFS/Samba) previously mounted in local file system.
- Removable drive as CD/DVD/USB hard drive.

Each collection set in configuaration dialog page can be named to be identified easily into Album GUI/Folder view.

There is a fresh screenshot of Collection Setup page at this url:

<a href="/issues/2007-11-11/files/digikamKDE4_14.png">http://digikam3rdparty.free.fr/Screenshots/digikamKDE4_14.png</a>;

TODO: in album gui, and especially in album folder view, we need to add a better support of collections name.