CBMutils: add documentation and unit tests for all v2 functions

[suz-estella]

See spreadsheet summary of:

• Function documentation complete (Susan note: I'm not sure if documentation is up to date)
• Function is known to be working
• Function has tests

Once complete: we should consider tagging a minor version - 2.1?

[cboisvenue]

I am not well versed in versioning. You do what you think is best. I can review/complete the descriptions for the functions (once I am back).