Periodic indexing

[lkdvos]

Not entirely sure why I didn't come up with this sooner, but this is a light version of the whole PeriodicArray machinery that just hides all of the mod stuff behind getters and setters.

I do still want to eventually allow more general array types with tilings etc, but this is non-breaking and at least slightly improves some of the more messy patches of code

[codecov]

Codecov Report

❌ Patch coverage is 91.05691% with 22 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/utility/indexing.jl	64.70%	12 Missing ⚠️
src/algorithms/contractions/bp_contractions.jl	95.45%	2 Missing ⚠️
src/environments/ctmrg_environments.jl	50.00%	2 Missing ⚠️
src/algorithms/time_evolution/get_cluster.jl	83.33%	1 Missing ⚠️
src/environments/bp_environments.jl	66.66%	1 Missing ⚠️
src/networks/infinitesquarenetwork.jl	66.66%	1 Missing ⚠️
src/operators/infinitepepo.jl	83.33%	1 Missing ⚠️
src/states/infinitepartitionfunction.jl	66.66%	1 Missing ⚠️
src/states/infinitepeps.jl	75.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/algorithms/bp/beliefpropagation.jl	93.93% <100.00%> (ø)
src/algorithms/bp/gaugefix.jl	97.53% <100.00%> (ø)
src/algorithms/contractions/absorb_weight.jl	100.00% <100.00%> (ø)
src/algorithms/contractions/bondenv/benv_ctm.jl	100.00% <100.00%> (ø)
.../algorithms/contractions/correlator/pepo_1layer.jl	100.00% <100.00%> (ø)
src/algorithms/contractions/correlator/peps.jl	100.00% <100.00%> (ø)
src/algorithms/contractions/ctmrg/gaugefix.jl	95.45% <ø> (ø)
...lgorithms/contractions/ctmrg/renormalize_corner.jl	94.73% <100.00%> (ø)
.../algorithms/contractions/ctmrg/renormalize_edge.jl	65.88% <ø> (ø)
src/algorithms/contractions/localoperator.jl	96.45% <100.00%> (ø)
... and 22 more

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[Yue-Zhengyuan]

I spotted places that have not been updated to use periodic indexing (mostly related to SU and BP). I'll push some changes on this.

[Yue-Zhengyuan]

Good to go for me!