- use parsedir result to append '/',
- use ftpOpenDir instead of recoding it by hand,
- handle special case of an empty path, for URLs without trailing slashes
(last problem found by brad@).
Turns out the launcher spawns children, but is not the main process.
For whatever reason, the SIGCHLD handler did not get propagated, and
it doesn't serve any purpose to add waitpid to Slave::kill, since it's
not run from the launcher, but the main process...
