He shall have power to remit fines and forfeitures, commute sentences, grant reprieves and pardons, except in case of impeachment, and he shall file with each application therefor a statement of the reasons for his decision thereon, which application and statement shall always be open to public inspection. In cases of treason, he shall have power to grant reprieves until the end of the next session of the General Assembly, in which the power of pardoning shall be vested; but he shall have no power to remit the fees of the Clerk, Sheriff or Commonwealth's Attorney in penal or criminal cases.