The discharge order under sub-section (2) of section 138 shall release the bankrupt from all the bankruptcy debt:
Provided that discharge shall not—
(a) affect the functions of the bankruptcy trustee; or
(b) affect the operation of the provisions of Chapters IV and V of Part III; or
(c) release the bankrupt from any debt incurred by means of fraud or breach of trust to which he was a party; or
(d) discharge the bankrupt from any excluded debt.