main
update inline comments to Go v1.19 doc format
tlog,tasklog: rename package 'tlog' to 'task'
Replace min/max helpers with built-in min/max
tasklog/log.go: print "done" messages with a trailing period
tasklog/percentage_task.go: add Complete() method
tasklog/simple_task.go: supply format string
tasklog: update tests
tasklog/{log,waiting_task}.go: fix code comments