braidingtensor special cases

[maartenvd]

some special cases for the braidingtensor action (+ some braidingtensor bugfixes)

also includes special case code for artin_braid, when the leg that is being braided is trivial.

[Jutho]

Thanks; there were still quite a few bugs in my part apparently :-)

[maartenvd]

How would you avoid the inference failures in artin_braid?

[codecov]

Codecov Report

Merging #56 (b5e7ef5) into master (1499f08) will decrease coverage by 3.06%.
The diff coverage is 8.19%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
- Coverage   71.02%   67.95%   -3.07%     
==========================================
  Files          34       34              
  Lines        4224     4441     +217     
==========================================
+ Hits         3000     3018      +18     
- Misses       1224     1423     +199     

Impacted Files	Coverage Δ
src/tensors/braidingtensor.jl	0.00% <0.00%> (ø)
src/tensors/planar.jl	0.00% <0.00%> (ø)
src/fusiontrees/manipulations.jl	93.77% <95.23%> (+0.03%)	⬆️

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[Jutho]

Hi Maarten; I did not have the time to review in detail the contraction code and the resolution of resolving all taus by @planar2, but a loop is also what I thought. I will merge so that you can continue while I am gone.

[maartenvd]

ah, unfortunately I still had an unpushed commit, containing another special case where scalars did not play well with planar, but also a bugfix for some special case braidingtensor actions. It should be the last of it, as I now have a fully planar copy of mpskit, which I guess is a fairly extensive test.

In any case, I don't particularly mind working with a forked copy of tensorkit for the time being - enjoy your holiday first and foremost!