WRITE_*_ARRAY macros for outfuncs.c

In readfuncs.c, we have READ_ATTRNUMBER_ARRAY, READ_OID_ARRAY,
READ_INT_ARRAY, READ_BOOL_ARRAY, but the writing side in outfuncs.c is
coded by hand in each case.  Any reason for this?

Here is a patch that adds WRITE_ATTRNUMBER_ARRAY, WRITE_OID_ARRAY,
WRITE_INT_ARRAY, WRITE_BOOL_ARRAY.  That seems much nicer.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
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