Suggestion: `Calculator(verbose=False)` should not print (or tqdm) any output

[bocklund]

The verbose output is helpful to see what's going on and get realtime feedback, but sometimes it's hard to find my output among all of pysipfenn's output. I'd like to be able to hide all the output (at least on the happy path, if stuff is breaking or not right, then being noisy is the right thing to do IMO).