get_fig() plotting function

[gilbertgong]

Pull Request

Implement get_fig() per issue 1, generate a Figure object which the user can then browse or write to disk

Description

Uses the code from the examples to implement get_fig()

Also, a default pip install -r requirements.txt resulted in an error, which is fixed by pinning scipy to version 1.8.1

Examples are updated.

Fixes

pins scipy to avoid potential incompatibility with newer versions

How Has This Been Tested?

Ran the example files

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[peterdudfield]

Thanks so much for doing this, do you mind add a screen shot of what the new plots look like?
Thanks

[gilbertgong]

The code is pretty much cut and pasted from the examples (only with changes to using instance variables as appropriate) so they look pretty much exactly the same as before.

[peterdudfield]

Thanks for this @gilbertgong

[gilbertgong]

I'll try consumption next =D

[peterdudfield]

#4 could be good to fix too?