doc improvements
added the initial lease implementation
Use more meaningful name
implemented lease-ssh and lease-tunnel commands
implemented lease-ssh and lease-tunnel commands
bug fixes
generate ssh_config file
better message
forgot to close
renamed commands for consistency

added selective alias termination
separated lease-add vs lease-start
auto-release all the leases when done
access control
bug fix
also delete the SSH config file
fixed a bug in the host computation
doc improvements
bug fix
a quick place holder for the SFTP support
renamed them