Implement coefficient computation.

[lsawade]

Task description

Implement computation of the GLL-wise coefficients

Given Q, frequency range etc. compute

1. use Q values
2. compute tau sigma
3. compute tau epsilon
4. compute coefficient \Psi_\kappa and \Psi_\mu (see notes)

note that tau_sigma and tau_epilon have separate implementations for computing them. Meaning that this function could assume that tau_epsilon and sigma are given.

Acceptance criteria

• Coefficients are correct.