Rename track_iotiming GUC to track_io_timing.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 309c64745ea145d7c731e1fe610631b2b84e7e88
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2012-04-29T20:23:54Z
Releases: 9.2.0
Rename track_iotiming GUC to track_io_timing.

This spelling seems significantly more readable to me.

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