some renaming and a correction

[ba2tro]

Correction from #35 , and renamed psis argument in project_traceout! to basis at the front end.

[codecov]

Codecov Report

Merging #42 (12fc25b) into master (29d87e4) will decrease coverage by 1.31%.
Report is 3 commits behind head on master.
The diff coverage is 52.59%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   65.15%   63.85%   -1.31%     
==========================================
  Files          23       23              
  Lines         927      971      +44     
==========================================
+ Hits          604      620      +16     
- Misses        323      351      +28     

Files Changed	Coverage Δ
src/QuantumSavory.jl	59.68% <ø> (+0.77%)	⬆️
src/CircuitZoo/CircuitZoo.jl	64.90% <49.60%> (-6.72%)	⬇️
src/baseops/traceout.jl	89.13% <83.33%> (ø)
src/backends/quantumoptics/express.jl	50.00% <100.00%> (ø)
src/backends/quantumoptics/quantumoptics.jl	88.37% <100.00%> (+0.27%)	⬆️

... and 1 file with indirect coverage changes

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