Join quad call

[felixhekhorn]

Numerics question: is it a good idea to join R+S+L under one integral?

because

• only then the "absoulte error" has its proper meaning
• it might be more acurate or even faster

in order to explore this, one would need to compute an exact convolution with say x^a(1-x)^b for various a and b and check the error and performance

a first but not followed attempt was made in #28

[stale]

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[felixhekhorn]

@alecandido are you sure we want to keep this open?

[alecandido]

We never had the time to try, and it should not take too much.

I'd like to keep up to the point we'll start working explicitly on performance, then we'll try and take a decision.