Brainstorm for cluster clustering

[marina-ricci]

Discussion with @ Alessandra Fumagalli.

Input :

• cluster catalog with ra, dec, z, richness
• I guess masks and depth maps
  Needed stages :
• stage to compute a random cluster catalog (at least 50x larger) with same masks and depth
• stage to bin the cluster catalog in redshift and richness
• stage to produce the 2d cross-correlation with radial bin as inputs