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doc: Update Recent development doc before feature freeze
doc: Release notes for v1.7.0
doc: Convert release notes for v1.3
doc: Add download info to release notes 1.4.0
doc: Add section about v1.5.1 into release notes
doc/release_notes: Add link to tarball for v1.6.0
doc: Update release notes v1.7.0 with link to tarball