Elections of County Commissioners, District School Board Members, and District School Superintendents; Requiring county commissioners to be nominated and elected by qualified electors who reside in the same county commission district as the commissioner; revising the membership of district school boards; requiring members of the district school board to be elected by the qualified electors who reside in the same school district as the member; revising provisions relating to the election and term of office for district school superintendents, etc.