Meanfield adjust

[j-moser]

• fixed an issue, where meanfield equations without defined order could not be completed
• fixed a bug, where elimination of redundant missed averages would result again in a redundant list, when using destroy operators as indexed ops
• reintroduces the scaling keyword to complete function, also added the possibility to also use the h keyword together with the scaling one
• added an error message, if meanfield is called with same indices in ops and J arguments
• added tests

[codecov[bot]]

Codecov Report

Merging #167 (f6d72e7) into master (9f021c2) will increase coverage by 0.28%. The diff coverage is 89.09%.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
+ Coverage   81.76%   82.04%   +0.28%     
==========================================
  Files          24       24              
  Lines        4601     4612      +11     
==========================================
+ Hits         3762     3784      +22     
+ Misses        839      828      -11     

Impacted Files	Coverage Δ
src/QuantumCumulants.jl	100.00% <ø> (ø)
src/index_scale.jl	67.48% <82.60%> (+0.49%)	:arrow_up:
src/index_meanfield.jl	82.22% <92.59%> (+2.47%)	:arrow_up:
src/index_correlation.jl	85.95% <100.00%> (ø)
src/index_utils.jl	96.55% <100.00%> (+1.29%)	:arrow_up:

... and 2 files with indirect coverage changes

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