[Geysers] Grand interval is changing?

[David Monteith]

Grand appears to have increased its interval

Table and graph from geysertimes.org
Date           Time	Interval
25 Oct 2012 @ 1451 ns wc 6h 54m
25 Oct 2012 @ 0757 E 	8h 1m
24 Oct 2012 @ 2356 E 	6h 52m
24 Oct 2012 @ 1704 E 	7h 56m
24 Oct 2012 @ 0908      8h 13m
24 Oct 2012 @ 0055 E 	8h 4m
23 Oct 2012 @ 1651 E 	8h 0m
23 Oct 2012 @ 0851 ie wc 5h 18m
23 Oct 2012 @ 0333 E 	5h 39m
22 Oct 2012 @ 2154 E 	5h 14m
22 Oct 2012 @ 1640 ie wc 5h 33m
22 Oct 2012 @ 1107 ie wc 5h 40m
22 Oct 2012 @ 0527 E 	6h 17m
21 Oct 2012 @ 2310 E 	5h 55m
21 Oct 2012 @ 1715 ie wc 6h 0m
21 Oct 2012 @ 1115      5h 27m
21 Oct 2012 @ 0548 E 	5h 14m
21 Oct 2012 @ 0034 E 	5h 25m
20 Oct 2012 @ 1909 ns wc 5h 35m
20 Oct 2012 @ 1334      5h 18m
20 Oct 2012 @ 0816      5h 12m
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