fix_giuh_array_water

[ajkhattak]

The PR fixed two bugs related to not accurately computing the leftover water in the GIUH array at the end of simulation, and in reading the giuh ordinates. No Changes to functionality.

Additions

• None

Removals

• None

Changes

• bug fixes

Testing

1. All existing tests pass

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (link if applicable)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Reviewers requested with the Reviewers tool ➡️

[peterlafollette]

I looked over the changes and these look good, I appreciate that the functionality wasn't changed except for fixing an off by 1 error in the GIUH queue. Merge when you want!