[master] Reformatted RELNOTES to restore 4.3.x change history
The Release notes for 4.4.0 had been aggregated into changes since 4.3.0. While this is in keeping with preceent, the sheer number of changes made any sense of chronology difficult. I have reformatted them such that changes for 4.4.0 are done relative to 4.3.6 as we would have done with a maintenance release.
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