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Fix detector orientations

Stephen Green requested to merge stephen.green/bilby:fix-L1-orientation into master

This addresses #606 (closed) as well as other detector orientations.

Summary of changes:

  • Add arm tilts for L1
  • Add arm tilts for K1
  • Swap arms for GEO600
  • Create a new test to compare plus polarizations against LAL

After fixing L1 orientation (as originally planned) the newly-created test failed on K1 and GEO600. It turns out that the K1 configuration did not include tilts either (resulting in a much larger error than L1, since K1 is more inclined), and that GEO600 configuration had swapped the X and Y arms entirely, resulting in O(1) deviations compared to LAL.

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