feature: restyling of Kirchhoff operator #528
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This PR introduces a number of changes to the Kirchhoff operator in an attempt to improve the amplitude fidelity of this modelling process with respect to finite-difference full wavefield modelling. Also follows from #439.
Major changes:
anglereflas the anglethetacan be computed directly from the incident and reflection angles with normalsnelllimitations, this is naturally handled by stationary-phase when summing along all possible image points and src-rec pairsampto be provided as pair of tables liketravampis not provided, compute it as1/sqrt(dist)for both source and receiver side in 2D (and1/distin 3D)cos(\theta)