- verify_knownhost: use new post 0.7 API, keeping old shim version
- actually implement the parallel copy mode
- fix bugs and leaks, clean up code
- explicit history file or one based on the -H parameter, so that
  you intermix history per task (e.g. slurm management, updates of
  all machines, etc.)
- rename project, cssh is well known cluster management software
- can we combine it with screen-like terminal switching? one
  common windows, separate windows per host..
- default locations for hosts file (and others)
- add features from cssh
  - clusters: named set of hosts
  - tags: for things line cssh -t centos -c yum update or so
  - meta commands like enable/disable some hosts/tags
- make password authentication optional
- make ignore-errors and auth-methods enums in gengetopt
- deprecated scp functions, sftp?
- corrupted size vs. prev_size in fastbins