subset (and maybe other methods?) need to remap individual.parent

[petrelharp]

... as noticed by @benjeffery in #1199.

[benjeffery]

Adding this to the C API milestone, as although it will delay it a little this is certainly a bug.

[benjeffery]

I've had to quickly implement this for #1199, but I think it needs more tests.

[petrelharp]

I've had to quickly implement this for #1199, but I think it needs more tests.

There's still the issue that subset will actually put individuals out of order. We'll fix this up in #1226.

[benjeffery]

@petrelharp This is the last issue for the release now, do you think you'll have time to pick it up? If not I can try and get my head around it?

[petrelharp]

I'll have a go at it now.

[benjeffery]

Closed by #1226