tests add for BW_DS_VanderBilt code contribution

[petravanhoudt]

add tests for code from Brian Welch and David Smith from VanderBilt

• add tests

• update json file

• update figures

• update manuscript if we do it before submission

[mjt320]

@petravanhoudt As you suggested, perhaps we should indeed postpone this until post-submission. More important to submit the manuscript.

[Aarshpatel12]

Hi @petravanhoudt and @mjt320,

I recently fixed the CI/CD build system in PR #138, so the test suite is fully operational again. I am interested in picking this task up to ensure the Vanderbilt contribution is properly tested.

Could you confirm if this is still relevant? If so, I can start by adding the missing unit tests for fit_tofts_model, fit_R1, and the other functions listed in the contributions record.

[mjt320]

Thank you @Aarshpatel12, that sounds great to me. However, please note the TF has new leaders: (see https://osipi.github.io/task-force-2-3/) so it's maybe best to check with them as well.