don't reconfigure engine while it is running
show_versions() displays cached state as "c"
new config var: $autosave
support autosave
don't autosave
comments
Initializations: initialize $config in the right place; add autosave field
delete relocated code
uncache_track() change over to EffectChains
CacheTrack: is_cached() only returns one result, to help with booleans
complain if EffectChain query for uncache_track finds multiple matches