status_snapshot_string(): avoid extra reconfigure caused by difference in JSON
representation of string/numerical of current_version,
e.g. "current_version" : 2 vs. "current_version : "2"
reconfigure_engine(): update $setup->{_old_status_snapshot} to avoid spurious reconfigure
Avoid duplicate help by excluding hyphenated forms.
We actually prefer hyphenated forms, but help indices
still require underscore form for full help.
rec_cleanup(): reset $project->{playback_position}
remove obsolete comments
update effect field names, hopefully fixing effect chain parameters not-applied