Standardise to LocalDFG in IIF

[Affie]

Close #1478

[codecov]

Codecov Report

Merging #1479 (1f76b00) into master (7645553) will decrease coverage by 1.42%.
The diff coverage is 51.77%.

@@            Coverage Diff             @@
##           master    #1479      +/-   ##
==========================================
- Coverage   77.35%   75.92%   -1.43%     
==========================================
  Files          67       70       +3     
  Lines        5007     5047      +40     
==========================================
- Hits         3873     3832      -41     
- Misses       1134     1215      +81     

Impacted Files	Coverage Δ
src/Factors/EuclidDistance.jl	30.00% <ø> (ø)
src/Factors/GenericMarginal.jl	22.22% <ø> (ø)
src/Factors/PartialPrior.jl	28.57% <ø> (ø)
src/IncrementalInference.jl	87.50% <ø> (ø)
src/SolverAPI.jl	90.57% <0.00%> (ø)
src/SubGraphFunctions.jl	97.56% <ø> (ø)
src/TreeMessageUtils.jl	85.21% <ø> (ø)
src/services/ApproxConv.jl	100.00% <ø> (ø)
src/services/CalcFactor.jl	89.85% <ø> (-0.08%)	⬇️
src/Deprecated.jl	3.22% <1.14%> (-30.11%)	⬇️
... and 23 more

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