Improve ICU option handling in CREATE DATABASE

Don't allow creation of database with ICU locale with unsupported encoding

Make locale option behavior more consistent

pg_dump: Dump colliculocale

Fix ICU locale option handling in CREATE DATABASE

Allow using Unix-domain sockets on Windows in tests

pg_regress: Observe TMPDIR

Enable Unix-domain sockets support on Windows

psql: Remove one use of HAVE_UNIX_SOCKETS

Allow building without default socket directory

Fix use of term "verifier"

Error out on too many command-line arguments

Back off output precision in circle.sql regression test.

Make SQL/JSON error code names match SQL standard

Remove configure detection of crypt()

Clean up some SCRAM attribute processing