import-log: add SuperToast external library
import-log: add OperationResults, use it in ImportKeys operation
canonicalize: first step(s)
import-log: use supertoast in ImportKeyActivity
import-log: add LogDisplay activity
import-log: some cosmetics
import-log: more interface work
import-log: switch to flags instead of statuses for result int
import-log: work on log fragment ui
import-log: use holder pattern in log fragment