add NEWS.md entry

dehann · dehann · commit eec6be51b777 · 2021-10-06T15:49:00.000-04:00
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+Listing news on any major breaking changes in DFG.  For regular changes, see integrated Github.com project milestones for DFG.
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+# v0.16.0
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+- `{Packed}VariableNodeData.infoPerCoord::Vector{Float64}` replaces previous `.inferdim::Float64`.  The change should have legacy support to help facilitate the transition.  This datastore is likely to only become part of critical computations downstream in IncrementalInference.jl v0.26, even though the previous `.inferdim` data values are being populated there.  (#804)
