fixups for 7.3 to contrib directories - Mailing list pgsql-patches

Just some fixups to a couple contrib directories I was trying out.

. replace CREATE OR REPLACE AGGREGATE with a separate DROP and CREATE
. add DROP for all CREATE OPERATORs
. use IMMUTABLE and STRICT instead of WITH (isStrict)
. add IMMUTABLE and STRICT to int_array_aggregate's accumulator function

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greg