Massive commit to run PGINDENT on all *.c and *.h files.

contrib/array/array_iterator.c

contrib/datetime/datetime_functions.c

contrib/int8/int8.c

contrib/pginterface/halt.c

contrib/pginterface/halt.h

contrib/pginterface/pginsert.c

contrib/pginterface/pginterface.c

contrib/pginterface/pginterface.h

contrib/pginterface/pgnulltest.c

contrib/pginterface/pgwordcount.c

contrib/soundex/soundex.c

contrib/string/string_io.c

src/backend/access/common/heaptuple.c

src/backend/access/common/heapvalid.c

src/backend/access/common/indextuple.c

src/backend/access/common/indexvalid.c

src/backend/access/common/printtup.c

src/backend/access/common/scankey.c

src/backend/access/common/tupdesc.c

src/backend/access/gist/gist.c