get_suite_name: improve support for rose-stem

Now look for `rose-stem/rose-suite.conf` in current directory.
rose suite-stop: add test battery
rose.suite_control: document auto "-n NAME" logic

Update the command reference for those commands that depend on
`rose.suite_control`. In particular, the logic to determine the suite name in
the absence of `-n NAME` is now documented correctly.
rose arch: error messages for rename format failures
rose arch: rename for upstream
rose arch: update
rose arch: fix extra script line, document
rose arch: improved regex exception
Merge pull request #919 from benfitzpatrick/rose-arch.report-bad-format

rose arch: report bad rename configuration
Merge pull request #915 from matthewrmshin/get-suite-name-for-rose-stem

rose.suite_control: improve support for rose-stem suites
rose edit: fix stash plugin bug
Merge pull request #920 from benfitzpatrick/rose-edit.stash-gui-fix-value-info-toggle

rose edit: fix stash plugin bug
rose host-select --choice=N

New option allows return from any of the top N choices.
rose host-select --choice=N: fix typo in docs
rose.host_select: rename HostThresholdNotMet event
Merge pull request #921 from matthewrmshin/rose-host-select.choice

rose host-select --choice=N
Merge branch 'master' into rose-bush

Conflicts:
	lib/python/rose/suite_run.py