v*.sbt.json files in tests/test-data are built from regular MinHashes, not scaled MinHashes

[ctb]

This prohibits containment searches (which don't work correctly on regular MinHashes).

In particular, this affects test_sbt.py::test_tree_old_load(...), which uses search_minhashes_containment incorrectly.

It's not clear what the best option is here -

• rebuild the test SBTs with scaled signatures?
• remove support for old SBTs?
• do something else?

[ctb]

• SBTs v2 was in commit - 4fdd26c - looks like v2.0.0a2.
• it's not clear that SBTs v1 were ever in a release by themselves? 16ec58a is what adds the SBT

[ctb]

v5 was never in a released version, either.

[ctb]

incidentally, this problem (the queries and SBTs being regular minhashes) makes it impossible to properly test the old SBTs. So that's the motivation for fixing it!

[ctb]

note also that v1.sbt.json doesn't support leaf iteration via .leaves() which in turn means it doesn't support Index.signatures().

[ctb]

in #1392 we disabled v1 and v2 tests, FBFW.