Made RDB_MAKE_ME_SERIALIZABLE_N macros force a trailing semicolon.
Removed unused type.
Deinlined new_namespace.
Moved joinable/equatable macros for namespace_semillatice_metadata_t to the cc file.
Removed default implementation of get_sharding_scheme.
Moved namespaces_semilattice_metadata_t macro defs to .cc implementations.
Renamed clustering/suggester/suggester.hpp to clustering/suggester/suggest_blueprint.hpp.
Removed some "unused" code (it was commented out).
Abandoned RSI about simply not implementing apply_json_t for invalid types.
Abandoned RSI about renaming rdb_namespace_interface_t.
Replaced RSI comment about binary_blob_t in metainfo_t with a non-RSI comment.
Merge branch 'next' into sam_803_rsi
Merge branch 'next' into sam_803_rsi
Merge branch 'sam_803_rsi' into next