'Inserts *token* after *where*.'

def insert_after(self, where, token, skip_ws=True):

    if (not isinstance(where, int)):
        where = self.token_index(where)
    (nidx, next_) = self.token_next(where, skip_ws=skip_ws)
    token.parent = self
    if (next_ is None):
        self.tokens.append(token)
    else:
        self.tokens.insert(nidx, token)
