transfering CSM 8a into parent

[dehann]

Mental model for what steps might be for untangling "CSM 8a pull model (#674)" which is required to resolve "#459 dwnMsg consolidation":

• redirect 4b needdownmsg to 7 instead (replacing 4c direction)
• absorb 4c into 7
• redirect 7 away from 7c, but to 8j instead
• add path from new 7 to 8a
• Redirect 8a away from 8j, but perhaps to 7b instead
• Finally fix 8a to pull model which should now be running in parent csm instead.

[codecov-commenter]

Codecov Report

Merging #892 into maint/20Q3/fixdown#459 will decrease coverage by 1.78%.
The diff coverage is 68.45%.

@@                    Coverage Diff                     @@
##           maint/20Q3/fixdown#459     #892      +/-   ##
==========================================================
- Coverage                   62.23%   60.44%   -1.79%     
==========================================================
  Files                          42       43       +1     
  Lines                        4748     4953     +205     
==========================================================
+ Hits                         2955     2994      +39     
- Misses                       1793     1959     +166     

Impacted Files	Coverage Δ
src/BeliefTypes.jl	25.00% <ø> (ø)
src/IncrementalInference.jl	80.00% <ø> (ø)
src/InferDimensionUtils.jl	70.45% <0.00%> (-12.31%)	⬇️
src/JunctionTreeTypes.jl	21.85% <ø> (-3.00%)	⬇️
src/TreeMessageUtils.jl	53.95% <ø> (-8.89%)	⬇️
src/Deprecated.jl	0.75% <2.00%> (-10.23%)	⬇️
src/CliqStateMachineUtils.jl	51.75% <28.33%> (-6.41%)	⬇️
src/SolverAPI.jl	67.07% <40.00%> (ø)
src/SolveTree.jl	58.73% <45.45%> (-0.37%)	⬇️
src/TreeMsgDwnConsolidation.jl	74.44% <82.14%> (+16.11%)	⬆️
... and 13 more

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[dehann]

finalizes pull model on #674