///
/// <summary> * remove a separationspec with a given name from this
/// * </summary>
/// * <param name="sep"> the separation name </param>
/// * <returns> int the index of the removed separation; -1 if none found </returns>
///
public virtual int removeSeparation(string sep)
{
VString vs = getSeparations();
int index = vs.index(sep);
if (index >= 0)
{
getSeparationSpec(index).deleteNode();
}
return(index);
}