Tweaks to l.o.s. sampling parameters and priors.
Overall improvements to line-of-sight sampling:
* Increased smoothing scale along DM axis to 0.1
* Introduced switching of nearby Delta(EBV)'s in l.o.s. guess
* Widened priors on both cloud and piecewise-linear models
* Widened range of guesses on both models
* Decreased penalty for missing star altogether (reduced impact of outliers)
Merge branch 'los-fit-tweaks' into develop