Public debt may be contracted and evidences of indebtedness issued therefor only to the amounts, for the purposes, by the procedures and with the kinds of evidence of indebtedness specified in this subchapter, except that this subchapter is not applicable:
(1) To public debt, not exceeding in the aggregate $100,000, incurred for the purpose of defraying extraordinary expenditures of the state.
(2) To public debt incurred to repel invasion, suppress insurrection or defend the state in time of war.