added loaner 8" to ST3

I had first thought about it while at Mew Lake, that I didn't have the Toronto Centre loaner Dobsonian 8" telescope in my SkyTools3 software and I should add it, so to quickly have a profile to work with. In particular, to quickly simulate a rotated field of view. At the time, I used my Mom's 6" reflector to have something to play with. I only remembered today.