History of printMilestone 1 change

In Contrib/tas/omr2txt.py, lines 274–276 on main. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 274,276:Contrib/tas/omr2txt.py.