Simplify compilation of t-route on WSL

[JurgenZach-NOAA]

To simplify compilation of t-route on non-traditional compute environments such as WSL, added the option to set a new alternative NETCDF environment variable, without interfering with the existing compile procedures (if said NETCDFALTERNATIVE is not defined). The value-add here is that no custom conda environment is needed any longer to set the pesky NETCDF include path on WSL.

Additions

• Adding optional logic for NETCDFALTERNATIVE to compiler.sh

Removals

Changes

Testing

1. On environments such as WSL, set your own alternative NETCDF include directory, e.g.:
   export NETCDFALTERNATIVE=$HOME/.conda/envs/py39/include/,
   Then run ./compiler.sh as before.

2. If that is not desired, follow present instructions, there are no changes.

Screenshots

Notes

Todos

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)
• Placeholder code is flagged / future todos are captured in comments
• Visually tested in supported browsers and devices (see checklist below 👇)
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

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

[kumdonoaa]

This change is still working for apd-dev. Good to go from my side.