Test and port core algorithms to Citlali

[Jerry-Ma]

We need to write tests for all the core algorithms that we are going to port to citlali. The same tests will be ported along with the covering functions to ensure correctness in the new citlali code.

Note that these tests should include both unit tests and feature tests.

Follows are a list of functionalities to be covered:

• Gaussian fitting (added with efed56f)
• PCA clean
• Time stream filtering
• Time stream sensitivity calculation
• Detector-level despiking
• Array-level despiking
• Telescope Pointing calculations
  see https://github.com/toltec-astro/macana2/blob/master/Observatory/Telescope.cpp
• Source Sky Coordinates calculations
  see https://github.com/toltec-astro/macana2/blob/master/Observatory/TimePlace.cpp
• kernel timestream generation
  see https://github.com/toltec-astro/macana2/blob/master/Observatory/Detector.cpp :1148
• all vector_utilities.cpp functions (or maybe these just get replaced by Eigen?)
• all astron_utilities.cpp functions (these must exist elsewhere!)

Test/simulated data creation and handling:

• netcdf format
• MUSCAT data handling
• simulated time-stream data
• ...

[GrantWWilson]

We should add time-stream filtering to the list of units that need help.

[Jerry-Ma]

We should add time-stream filtering to the list of units that need help.

Just updated the issue body. You should be able to edit the body as well.