Log Message:
-----------
Display explain buffers measurements in memory units rather than blocks. Also show "Total Buffer Usage" to hint that these are totals not averages per loop
Modified Files:
--------------
pgsql/src/backend/commands:
explain.c (r1.200 -> r1.201)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/explain.c?r1=1.200&r2=1.201)