Inconsistent Szego options use

[ehkropf]

Szego kernel uses options structure inconsistently. See properties newtTol and beNoisy, which just copy stuff from szset. Better to just store the options structure? (Hint: yes.)

[tobydriscoll]

I also wonder why the class name szmap is used rather than szegomap.

[ehkropf]

I used szmap because I was on a brevity kick. We can rename it if you so vote. It makes sense to me to use the longer name as it's more descriptive. I'm also inertially resistant at times, which is why I just left it like that.