Cluster example implementing SDSS cluster number counts and mean masses.

[yyzhang]

Cluster example implementing SDSS cluster number counts and mean masses.

1. Updated syntaxes in "demo_sacc_for_clusters.ipynb" to work with new syntaxes.

2. Generate SACC file that correspond to SDSS cluster observables.

• Implemented a "generate_SDSS_ClusterCountsMass_sacc_data.py" in examples to generate new SACC file corresponding to SDSS cluster counts and mean masses.
• But not sure how to test this file
• Also thought that this could be merged into generate_rich_mean_mass_sacc_data.py as a separate function to be called by the main code.

3. Configure osmosis and fire crown to work with SDSS SACC file

• New osmosis ini file: cluster_SDSS_counts_mean_mass_redshift_richness.ini
• New python file to be used by Firecrown likelihood: cluster_SDSS_redshift_richness.py