An Act amending the act of February 1, 1974 (P.L.34, No.15), known as the Pennsylvania Municipal Retirement Law, in general provisions, further providing for the definitions of "beneficiary" and "survivor annuitant"; in provisions relating to municipal employes, providing for rights of municipal employes' spouses, and further providing for options on superannuation or early retirement; in provisions relating to municipal firemen and municipal police, further providing for options on superannuation or early retirement; and, in optional retirement plans, further providing for options on superannuation or early retirement.