Various improvements related to backhaz#8

Merged

dom-muston merged 7 commits intomainfrom feat-backhaz

Jan 27, 2024

Commits on Jan 21, 2024

Correct order of t1 and t2
Dominic Muston
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Amend date
Dominic Muston
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URLs in references
Dominic Muston
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In analysing PPS, require TTP.flag==1
Dominic Muston
committed

Commits on Jan 22, 2024

Bootstrap sample correction for PPS
Dominic Muston
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Commits on Jan 27, 2024

Acknowledging 3 approaches to background mortality
Dominic Muston
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Update news date
Dominic Muston
committed