updating LASAM to take field capacity as a parameter in the config file

[peterlafollette]

[Short description explaining the high-level reason for the pull request]

Additions

In this PR, LASAM has been mildly refactored in order to have the field capacity be a user-specified parameter in the config file, in the same style as wilting point. I also updated the calibratable params list in bmi_lgar.hxx to include field capacity, as well as max ponded head. I also edited that list to not include vg_m and instead use vg_n, because the parameters file provides n rather than m.

Removals

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Changes

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Testing

1.

Screenshots

Notes

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Todos

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Checklist

• [x] PR has an informative and human-readable title
• [x] Changes are limited to a single goal (no scope creep)
• [x] Code can be automatically merged (no conflicts)
• [x] Code follows project standards (link if applicable)
• [x] Passes all existing automated tests
• [x] Any change in functionality is tested
• [x] New functions are documented (with a description, list of inputs, and expected output)
• [x] Placeholder code is flagged / future todos are captured in comments
• [x] Visually tested in supported browsers and devices (see checklist below :point_down:)
• [x] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• [x] Reviewers requested with the Reviewers tool :arrow_right:

Testing checklist

Target Environment support

• [ ] Windows
• [ ] Linux
• [ ] Browser

Accessibility

• [ ] Keyboard friendly
• [ ] Screen reader friendly

Other

• [ ] Is useable without CSS
• [ ] Is useable without JS
• [ ] Flexible from small to large screens
• [ ] No linting errors or warnings
• [ ] JavaScript tests are passing

[peterlafollette]

Updated so that unit tests pass with n rather than m, will add max ponded depth and field capacity to unit test for calibration today / tomorrow

[peterlafollette]

Updated so that unit test checks calibration for all calibratable variables, including n, max ponded depth, and field capacity.