Improve `pgrep` `cylc run` pattern

The old pattern was stopping `foo` from starting if `foo-bar` is
running. This change should fix the problem.
Merge pull request #1480 from matthewrmshin/fix-pgrep-cylc-run

Improve `pgrep` `cylc run` pattern
rose_arch: print archive STDOUT once

It was printing it twice.
Merge pull request #1482 from matthewrmshin/fix-rose-arch-cmd-out

rose_arch: print archive STDOUT once
Update CHANGES.md