Fix detector orientations
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.