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* Remove the previous method of applying the overlay by flags. In the future the overlay can just be mounted as a filesystem layer. This is probably how layers were intended to work in the first place. * Move the filesystem module info and filesystem name from the fs_mount to the fs_volume structure. Filesystem layering is done by having multiple layered volumes and we want to be able to have a different fs per layer. * Adapt VFS code to this move. * Implement mounting layered filesystems. Specifying multiple filesystems separated by a colon on mount will cause the layers to be set up and the corresponding filesystems to be mounted at that layer. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29199 a95241bf-73f2-0310-859d-f6bbb57e9c96