read/write proper schedule date (amending 9da3019e1ee5);

allow read/write of schedule in build (read via option, write from tool);

file representation for schedule (e.g., for generating from external tool);

proper median/mean time;

remove schedule outdated limit: delay is sufficient;

tuned whitespace;

tie-breaking in schedule optimization to pick best schedule even when run-time is dominated by large task (e.g., session with long timeout but no data yet);