List developments since v1.0 paper

[marina-ricci]

As we discussed writing a v2.0 note we need to list the developments that took part since the first CLMM paper. See discussion here : https://github.com/LSSTDESC/CLMM/issues/474 for desired additions.

[marina-ricci]

• ClusterEnsemble object (#457 )
• source redshift treatment (#517 )
• Einasto and Hernquist profiles from CCL (#461 )
• 2halo term for delta sigma (#459 )
• simple covariance computed for a cluster ensemble
• ....

[hsinfan1996]

• Mass conversion for the halo mass density profiles (#473 )
• Related to "source redshift treatment", second-order approximations for magnification and magnification bias (first-order for reduced tangential shear was called 'applegate14' and second-order 'schrabback18')

Minor ones

• Use analytical form for the CDF of source z distribution (#451 )
• Allow CT backend to use "critical" mass definition (#495 )
• Allow setting Einasto alpha parameter for CCL backend (#557 )