search --containment needs better documentation and takes arguments in reverse of prefetch and gather

[ctb]

ok so I'm working on helping someone with debugging a thing, and I just noticed: sourmash search --containment A B shows the containment of A in B. That is, if you have a metagenome and a genome, you want to do:

search --containment genome metagenome

this is the opposite of prefetch and gather, both of which take the metagenome as the left-hand-side or query.

The docs for search are not clear on this 😅 .

ref:

• upgrade search to display more information? #2002

[ctb]

I guess this makes some sense - you are used to searching for something in a list of databases, so search query targets makes sense here. I'm just completely brainwashed by thinking about gather so much!

[ctb]

note to self: remember to update the argparse help as well.