Fix commas in pop count

[paigeh-fsa]

Pull Request submission

I've added in a couple lines that will replace any comma in the census NI dataframe (for population) and will make these columns integers.

Closes or fixes

Fixes #356

Code

• [x] Requirements My/our code matches the requirements of the ticket
• [x] Functionality: New functions meet requirements in issue ticket
• [x] Compliant Code Code is as PEP 8 compliant as I can humanly make it
• [x] Code runs The code runs on my machine
• [x] Clean Code
  • [ ] Code has been linted (use your favourite linter)
  • [ ] Code adheres to DRY

Documentation

Any new code includes all the following forms of documentation:

• [ ] Function Documentation Docstrings within the function(s') definition(s) have been created
  • [ ] Includes parameters and returns for all major functions
  • [ ] Includes data types
• [ ] Updated Documentation: Working doc has been updated and a new ticket to update the master documentation has been created.

Data

• [x] All data needed to run this script has been added to Sync

Testing

• [ ] Unit tests Unit tests have been created and are passing or a new ticket to create tests has been created

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Peer Review Section

• [ ] All requirements install from (updated) requirements.txt
• [ ] Documentation has been created and is clear - check the google Doc
• [ ] Doctrings (Google format) have been created and accurately describe the function's functionality
• [ ] Unit tests pass, or if not present a new ticket to create tests has been created
• [ ] Code runs The code runs on reviewer's machine

Final approval (post-review)

The author has responded to my review and made changes to my satisfaction.

• [ ] I recommend merging this request.

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Review comments

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These might include, but not exclusively:

• bugs that need fixing (does it work as expected? and does it work with other code that it is likely to interact with?)
• alternative methods (could it be written more efficiently or with more clarity?)
• documentation improvements (does the documentation reflect how the code actually works?)
• additional tests that should be implemented (do the tests effectively assure that it works correctly?)
• code style improvements (could the code be written more clearly?)

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