code: public GP splitAtLast(ST obj, PT startPoint) {
  		return splitAt(lastIndexOf(obj, startPoint), true);
  	}
docs: Split this path and retains the first part of the
  part in this object and reply the second part.
  The last occurence of the specified element
  will be in the second part.
  
  <p>This function removes until the <i>last occurence</i>
  of the given object.
  
  @param obj the reference segment.
  @param startPoint is the starting point of the searched segment.
  @return the rest of the path after the last occurence of the given element.