Costs

All costs of and incidental to the presentation of a petition and to the proceedings consequent thereon shall be defrayed by the parties to the, petition in such manner and in such proportions as the judge may determine, regard being had to the disallowance of any costs which may, in the opinion of the judge, have been caused by vexatious conduct, unfounded allegations or unfounded objections, on the part of either the petitioner or the respondent and regard being had to the discouragement of any needless expense by throwing the burden of defraying the same on the parties by whom it has been caused, whether such parties are or are not on the whole successful.