bugfix: stage names
prettier yet
nogc-friendly AVL classes, now using standard RECYCLING_POOL
keep only the first line of commit messages
fixed first-line commit message + more work on time estimation display
not really useful, but for coherence
forgot to commit this class :-(
better time display
better time display yet: introduced days (yes, an ET run is more than one day long)
check should only print to stdoud in case of error or if in verbose/i.e. cmdline mode
comment added