Waiting for 8.5 – buffers info for explain

Today small, but (at least for me) really useful patch. Committed on 15th of December by Robert Haas, and written by Itagaki Takahiro, this patch does:

Log Message:
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Add an EXPLAIN (BUFFERS) option to show buffer-usage statistics.
 
This patch also removes buffer-usage statistics from the track_counts
output, since this (or the global server statistics) is deemed to be a better
interface to this information.
 
Itagaki Takahiro, reviewed by Euler Taveira de Oliveira.

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