Making pynch into a package

[e-eight]

I think this is a very useful project. Particularly in my case, I am using this as a dependency for other projects that use the AME/NUBASE data. It is much easier to use as a dependency if it can be installed as a package with pip.

I made a fork and made some modifications so that it can be packaged. The main modifications:

1. Moved all the code to src: src/pynch, src/app.py
2. Moved the data to src/pynch/data
3. Replaced the hard links to the data with importlib.resources
4. Renamed Nubase to NUBASE to match AME

You can take a look at my fork here: https://github.com/e-eight/pynch/. You can install it with pip install git+https://github.com/e-eight/pynch.git.

If you are okay with the changes, I can create a PR for you to merge.

[php1ic]

Hi @e-eight,

I'm glad you find this project useful and thank you for the suggestion. I like the idea of creating an installable package so happy for you to create a PR from your fork.