make z-symmetry usage explicit in GW150914 example

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Issue #2486 resolved
Roland Haas created an issue

The GW150914 parfile uses Llama’s z symmetry (bitant) to reduce cost. However there is no check in the script that enforces this nor is it (at all) apparent from the Python code that z symmetry is used. The most obvious issue is that the script seems to offer the user to change all 3 components of the reduced spin chi while for z-symmetry only the z component of spin may no non-zero (spin being an axial vector).

Pull request

removes the x,y components of chi from the script and adds an explicit check for symmetry violating ID parameters to the script.

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