genbank-d2 database is too big...

[ctb]

I'm working on revamping the tutorials, and the genbank-d2 database doesn't fit in ~15 GB when unpacked, which makes it impossible to run on a default Jetstream m1.medium machine. Sigh.

What are our options for making a db that's smaller when unpacked, @luizirber?

[ctb]

now that I think of it, one simple solution is to use the LCA database, since sourmash gather works on that in the same way and it's much smaller. What do you think of that as a stopgap measure?

[ctb]

this is what I did in ff22e2f, part of #631.

It would still be good to get a rundown of what our options are for SBTs!

[luizirber]

I pulled #648 out of some other indexing refactoring I was doing in #456 . This supports loading data directly from a Zip file. It would work with tar too, but they don't support random access well (see #490 for more info).

[ctb]

As of #648 sourmash now supports direct search of SBTs in zip files!