sbool renameFileVerbose(File a, File b) {
  if (a == null || b == null) false;
  print("Renaming " + f2s(a) + " to " + f2s(b) + "? " + yesNo2(a.renameTo(b)));
}

static bool renameFileVerbose(File a, S newName) {
  ret renameFileVerbose(a, fileInSameDir(a, newName));
}