Remove inner constructor PackedGenericMarginal

[Affie]

close #1483

[dehann]

Ah, yeah thanks! we should remove the inner constructors that aren't explicitly necessary. I've been pulling them out too.

[codecov]

Codecov Report

Merging #1484 (122c1b2) into master (f9960ed) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1484      +/-   ##
==========================================
+ Coverage   75.95%   75.96%   +0.01%     
==========================================
  Files          70       70              
  Lines        5048     5046       -2     
==========================================
- Hits         3834     3833       -1     
+ Misses       1214     1213       -1     

Impacted Files	Coverage Δ
src/Factors/GenericMarginal.jl	28.57% <ø> (+6.34%)	⬆️
src/NumericalCalculations.jl	91.75% <0.00%> (-1.04%)	⬇️

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