code: public boolean removeFrom(ST obj, PT pt) {
  		return removeAfter(indexOf(obj, pt), true);
  	}
docs: Remove the path's elements after the
  specified one which is starting
  at the specified point. The specified element will
  be removed.
  
  <p>This function removes after the <i>first occurence</i>
  of the given object.
  
  @param obj is the segment to remove
  @param pt is the point on which the segment was connected
  as its first point.
  @return <code>true</code> on success, otherwise <code>false</code>