added the "lagrange diff" code, which is intended to replicate Molinari et al's CUTEX code for determining maximum curvature (not for source extraction).  I haven't yet figured out exactly how they computed the lagrange coefficients, and I'm interested in testing different numbers of pixels... but I have implement other second-derivative finite-difference filters.
added the "lagrange diff" code, which is intended to replicate Molinari et al's
CUTEX code for determining maximum curvature (not for source extraction).  I
haven't yet figured out exactly how they computed the lagrange coefficients,
and I'm interested in testing different numbers of pixels... but I have
implement other second-derivative finite-difference filters.


git-svn-id: 4511b3d811903a91403bf66535cdd426db6c410e@328 7a03b35a-38c0-11de-8fef-1f5ae417a2df

keflavich/agpy,keflavich/agpy,astocko/agpy,astocko/agpy,astocko/agpy,astocko/agpy,keflavich/agpy,keflavich/agpy