fixed bugs in the keep population flag.

[SwiftySalmon]

• filter out where gender not 1 or 2
• deal with negative ages where dob is after mid point of year
• previously filtered cases where dod was before midpoint, but was also accidentally removing cases with missing death dates! Now fixed.
• added filter for nsu only once calculations are done

[lizihao-anu]

Thanks for the fixing

[github-actions]

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popluation

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Errors (2)

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❌ Errors	Count
❌ ignored-expect-variant	13
ℹ️ no-newline-at-eof	1

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[Jennit07]

Just thought of another way to check this - I'll use the function to match onto the existing files and produce an extract for Laura. Then ill run the dementia code and see what output we get.