REL_16_13
Gene Selkov's CUBE datatype (GiST example code)
Rework pg_input_error_message(), now renamed pg_input_error_info()
Build all Flex files standalone
Remove useless whitespace at end of lines
Fix whitespace
Make contrib modules' installation scripts more secure.
Distinguish selectivity of < from <= and > from >=.
Update extensions with GIN/GIST support for parallel query.
Add binary I/O capability for cube datatype.
Convert a few datatype input functions to use "soft" error reporting.
Remove deprecated containment operators for contrib types.
New header varatt.h split off from postgres.h
Update copyright for 2023