Covariance work during sprint week:

[damonge]

• [x] Automatically produce Gaussian covariance matrix for 4-bin case
• [x] Validate the above using Gaussian simulations
• [x] Code up the SSC contribution

I will work on this during the sprint week

[damonge]

Just added one task above to validate the Gaussian calculation using Gaussian simulations.

[damonge]

All of this has now been done (kudos for @anicola and @slosar)