maint: Further clean up of functions in ode/private dir. * AbsRel_Norm.m, fuzzy_compare.m, integrate_adaptive.m, integrate_const.m, integrate_n_steps.m, ode_struct_value_check.m, odepkg_event_handle.m, odepkg_structure_check.m, runge_kutta_45_dorpri.m: Place latest copyright first in file. Use two spaces before beginning single-line comment. Use parentheses around variable to be tested in switch stmt. Use space between function name and opening parenthesis.