TensorKit v0.16.4 changes

[lkdvos]

Fixes #49

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.78%. Comparing base (f1df152) to head (2275112).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
- Coverage   56.25%   55.78%   -0.48%     
==========================================
  Files          19       19              
  Lines        1422     1427       +5     
==========================================
- Hits          800      796       -4     
- Misses        622      631       +9     

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[kshyatt]

Re scalar indexing, does the change I added in #48 fix it? Feel free to copy-paste it if so

[lkdvos]

Thanks for the suggestion, that's a good point. Since I want to move in any direction that goes away from BlockArrays.jl, I'll just "vendor" that implementation (which I think should also fix part of that other PR)