Print suite timings in test battery results.
Complete the test suite for dynamic host selection.

It was testing dynamic host selection by command, but not by environment
variable.
Correct an in-source comment.
User Guide: pyro, passphrases, ssh, polling (section Running Suites).
User Guide: documented automatic polling on restart

plus a few other User Guide corrections and updates.
User Guide suite.rc reference: documented job submission retries.
User Guide: documented job poll and kill.
Merge pull request #491 from hjoliver/test-battery-suite-timers

Print suite timings in test battery results.
Merge pull request #495 from hjoliver/249.test-host-select-by-env

Complete the test suite for dynamic host selection.