ENH(lensing): deflections from weak lensing #108
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Adds functions to simulate deflections due to weak gravitational lensing:
from_convergence()computes other weak lensing fields from the convergencedeflect()applies deflections to a set of positionsAn exact definition of what "deflection" means in GLASS is added to the glossary.
This functionality so far only covers the raw physical process of deflecting a point. To compute the observed positions of a set of sources under weak lensing, we will need a new high-level function
lensed_positions(), say, that solves the lensing equation by repeatedly callingdeflect().Closes: #106
Added:
deflect()applies deflections to positionsAdded:
from_convergence()returns other lensing fields given the convergenceDeprecated:
shear_from_convergence()is deprecated in favour offrom_convergence()