[xrdcopy] Implement recursive remote-to-local copy
[XrdCl] Use ToStr() instead of GetErrorMessage() when dirlist fails
[XrdCl] Return XRootDStatus object instead of 0 in MakePath()
[XrdCl] Pass URL by const reference rather than by value
Merge pull request #25 from jussy/master

[XrdCl] Implement recursive remote copy