Error message editing in contrib (mostly by Joe Conway --- thanks Joe!)

contrib/btree_gist/btree_num.c.in

contrib/btree_gist/btree_ts.c

contrib/btree_gist/expected/btree_gist.out

contrib/chkpass/chkpass.c

contrib/cube/buffer.c

contrib/cube/cubeparse.y

contrib/cube/expected/cube.out

contrib/dblink/dblink.c

contrib/dblink/expected/dblink.out

contrib/dblink/sql/dblink.sql

contrib/dbmirror/pending.c

contrib/dbsize/dbsize.c

contrib/earthdistance/earthdistance.sql.in

contrib/earthdistance/expected/earthdistance.out

contrib/fulltextindex/fti.c

contrib/fuzzystrmatch/fuzzystrmatch.c

contrib/intagg/int_aggregate.c

contrib/intarray/_int.h

contrib/intarray/_int_bool.c

contrib/intarray/_int_op.c