gitignore.
- Split test Make target to a few targets (files that are generated).
- Adjusted test Make target for different key types.

  passed, if public keys exist).
- Finished work on handling different key types (entering testing phase).

- Updated documentation accourdingly.

  users PATH, adjusted test target accordingly.
- The clean target will also kill the running sshd instance if the sshd.pid file
  is present.