Save initial path upon successful connection

The browser window has to know the path of the directory it displays,
since it will have to modify the path in order to move up and down the
directory structure. Make the connection successful signal notify the
browser window of the initial path that the window should display.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>
Show subdirectories when they are activated

We can show the content of a subdirectory by constructing a new path and
get a listing of the content in that directory. Further considerations
has to be made regarding the construction of the path. We currently only
append new path segments, with no possibility to remove a path segment.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>