gaussian fit 2d sometimes produces vectors outside of the camera

[markasoftware]

Needs to be fixed, and also assertions added at the end of the centroiding step to make sure it doesn't happen again.

[markasoftware]

[markasoftware]

./lost/lost pipeline --fov=20 --generate-false-stars=400 --generate-zero-mag-photons=10000 --generate-saturation-photons=25 --generate-blur-ra=0.3 --generate-blur-de=0 --generate-blur-roll=4 --generate-exposure=0.2 --generate-dark-current=0.25 --centroid-algo=lsgf2d --generate=1 --generate-random-attitude=1 --generate-seed 123123169