Australian and New Zealand time zone fixups:

"SYD" (Sydney) +10:00, is now "AEST" with a DST (+11:00) counterpart, AEDT.
Added ACST (+9:30) with its DST (+10:30) counterpart, ACDT.
"WEL" (Wellington) +12:00 is now "NZST" with a DST (+13:00) counterpart,
NZDT.