forward position change tracking - keeping track of several rounds of text modifications allowing to trace a position in the original
text along the modifications to the corresp.
Notes that the progress is at d, prints dots if necessary,
calculates and displays the estimated time after 60sec of the progress
then again after every 30min
(takes only effect iff current Announce level >= the given lvl)
Notes that the progress is at d, prints dots if necessary,
calculates and displays the estimated time after 60sec of the progress
then again after every 30min
Writes s, prepares to make progress up to max
remembers id as name for progress counter (and prints it if necessary)
(takes only effect iff current Announce level >= the given lvl)