Hi João,
It appeared to be a simple program in Tcl, which you should have, as it comes with Pd. The usage is: tclsh changeCoords.tcl patchName xcoord ycoord line1 ?line2? ... lineN arguments may be a number or a range, like 12-15.
The patch is currently dumped to the console. Only minimal checking is done.
If you remove the #'s for the puts "..." lines, you can see some interim results (which will ruin the patch format).
Greetings,
Fred Jan