History of handleProcessingInstruction 1 change

In Contrib/tas/txt2omr.py, lines 23–70 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 23,70:Contrib/tas/txt2omr.py.