Family tree fixes

svornostrequested to merge
svornost/fc-pregmod:family-tree-fixes into pregmod-master

Always show the slave in question in the family tree, even if they have no relatives.

Don't duplicate slaves from the missing slave table when they are related to multiple living slaves.

Fixes #1463 (closed).

Fixes #1464 (closed).

Edited by svornost

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