Compress top-level metadata

[brianzhang01]

I've been using the top-level metadata to store information related to the coordinates of my tree sequences (since tree sequences only have a sequence_length rather than a start / end position). It appears that this information is lost when compressing / decompressing using tszip. I believe this PR should resolve it; I'm also happy for things to get rewritten in a more sensible way.

[pep8speaks]

Hello @brianzhang01! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-04-07 21:48:57 UTC

[jeromekelleher]

Looks good to me, thanks for the update @brianzhang01!

@benjeffery, I've made a few issues for us for the next release. I suggest we merge this PR, and then follow up with the more general solution in #39.

[brianzhang01]

Just checking in on the status of this PR. Thanks!

[jeromekelleher]

Thanks @brianzhang01 - @benjeffery is on vacation at the moment, and I think we'll try to clear this up and push out a release of tszip fairly soon after he's back. I'd imagine we'll merge your PR as is, and then update from there.

[brianzhang01]

Understood!

[benjeffery]

Thanks @brianzhang01! We'll give tszip a little TLC - thanks for the PR.