Symbolicsv3

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.34483% with 17 lines in your changes missing coverage. Please review.

Project coverage is 78.36%. Comparing base (8719ab5) to head (dc4509a). Report is 8 commits behind head on master.

Files	Patch %	Lines
src/index_average.jl	81.81%	6 Missing :warning:
src/index_meanfield.jl	76.92%	3 Missing :warning:
src/indexing.jl	72.72%	3 Missing :warning:
src/latexify_recipes.jl	0.00%	2 Missing :warning:
src/qnumber.jl	66.66%	2 Missing :warning:
src/index_double_sums.jl	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #216 +/- ## ========================================== - Coverage 78.63% 78.36% -0.28% ========================================== Files 26 26 Lines 5379 5389 +10 ========================================== - Hits 4230 4223 -7 - Misses 1149 1166 +17 ```

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[david-pl]

@oameye this is finally a version that works with the new Symbolics versions. It directly bumps to v3 of SymbolicUtils. Is that an issue for you? Also, it would supersede your PR #212

[oameye]

@david-pl @ChristophHotter Thank you for completing this PR! I couldn't figure it out myself. I don't need compatibility with older versions. So you have my approval to merge :)

[oameye]

🎉 Thanks for pushing this!