CBC Television will honour Ernie Coombs, a.k.a. Mr. Dressup, with a one-hour special Wednesday. Coombs, who died earlier this week following a stroke, was a staple of Canadian television for 32 years, starting in 1967. Besides replaying excerpts from Mr. Dressup, the special, which starts at 8 p.m. in all time zones, includes interviews with fellow children's entertainers Fred Rogers and Fred Penner. Staff