Remove 2 SATA drives for now.

The root_raid was a bad idea. Not doing that again.

The wdc_wd5002aalx_0 drive turned out to be from my backup
ZFS pool, so it's gone until I find another drive.
fatal log message on obscene latency numbers

Probably a bug in fio somewhere.
Add dumpCSV()

Dumps the CSV used to render graphs to files in the same directory
as the graphs. Useful for inspection and possibly for a D3 interface
one of these days.