…at is commented out.
…alling back on Etc.getlogin().
Prompted by c3c9b2a#commitcomment-5244269
Add ssh protocol via external ssh/scp commands.
Include fixes for clonezone comments: - use Fig::ExternalProgram instead of `` - add "-n" option to ssh command line - use better error messages - fix new class and function comments
Ruby's SSH/SFTP uses OpenSSH, which doesn't work nicely with some commercial SSH libraries. New protocol code uses external ssh/scp tools. To simplify implementation, it's currently expected the remote to be a Linux machine to execute commands through ssh: - find - mkdir - stat