Arbitrary grid updates #220

Job	Run time
test (d2q9, float, same, true)	5m 17s
test (d2q9, float, same, false)	5m 5s
test (d2q9, float, half, true)	6m 8s
test (d2q9, float, half-shift, true)	5m 54s
test (d2q9, float, float, true)	5m 23s
test (d2q9, float, float, false)	5m 20s
test (d2q9, float, float-shift, true)	5m 50s
test (d2q9, float, float-shift, false)	5m 9s
test (d2q9, double, same, true)	5m 10s
test (d2q9, double, same, false)	5m 45s
test (d2q9, double, half, true)	5m 15s
test (d2q9, double, half-shift, true)	5m 19s
test (d2q9, double, float, true)	5m 17s
test (d2q9, double, float, false)	4m 57s
test (d2q9, double, float-shift, true)	5m 37s
test (d2q9, double, float-shift, false)	5m 12s
test (d2q9, double, double, true)	5m 29s
test (d2q9, double, double, false)	5m 12s
	1h 37m 19s

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