Checklist for BMI release

[mdpiper]

Adding new functions in a BMI release sets off a series of updates for downstream products. This issue lists those updates.

• Complete all tasks for the current milestone
• Update documentation
• Update existing language specifications (C, C++, Fortran, Python, Java), including conda-forge recipes
• Update existing example implementations (C, C++, Fortran, Python, Java), including new tests
• Create (a specification and) an example implementation for any newly supported languages
• Add new BMI functions to the language templates in the babelizer (this may also require a new --bmi-version option)
• Add new BMI functions to the bmi-tester (and update --bmi-version option)
• Add new BMI functions to pymt