in-place operations no longer have to be in-place

[maartenvd]

I think this would make the tensorkitad code work in all cases

[codecov]

Codecov Report

Merging #110 (fdea72f) into master (45e9bf5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #110   +/-   ##
=======================================
  Coverage   77.02%   77.02%           
=======================================
  Files          22       22           
  Lines        1985     1985           
=======================================
  Hits         1529     1529           
  Misses        456      456           

Impacted Files	Coverage Δ
src/indexnotation/parser.jl	87.77% <100.00%> (ø)
src/indexnotation/preprocessors.jl	60.86% <100.00%> (ø)

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