* desktop-registry.el (desktop-registry--canonicalize-dir):
(desktop-registry-current-desktop): New functions.
(desktop-registry-add-directory): Use
`desktop-registry--canonicalize-dir' to get the "clean" directory
name.
- desktop-registry.el (desktop-registry--completing-read):
(desktop-registry-remove-desktop): New functions.
(desktop-registry-change-desktop): Use
`desktop-registry--completing-read' to interactively ask the user
which desktop to switch to.
