[XrdCl] Clean up some smart pointers
[XrdCl] Update some license headers
[XrdCl] Make DeepLocate indicate partial success if some of the requests failed
[XrdCl] Make xrdfs print a warning if a partial success was returned by DeepLocate
[XrdCl] Propagate info about partial success from DeepLocate to LS
[XrdCl] Correct error messages