A sentence of imprisonment for any term of more than one year and less than for life suspends all the civil rights of the person so sentenced, and forfeits all public offices and all private trusts, authority, or power during such imprisonment.
Whoever is sentenced to imprisonment for life is thereafter deemed civilly dead.
The provisions of sections 91 and 92 of this title shall not be construed to render the persons therein mentioned incompetent as witnesses upon the trial of a criminal action or proceeding, or incapable of making and acknowledging a sale, conveyance of property or will.