Fixed to the phase-field model #311

Job	Run time
test (d2q9, float, same, true)	4m 12s
test (d2q9, float, same, false)	4m 41s
test (d2q9, float, half, true)	4m 20s
test (d2q9, float, half-shift, true)	4m 16s
test (d2q9, float, float, true)	4m 18s
test (d2q9, float, float, false)	3m 58s
test (d2q9, float, float-shift, true)	4m 13s
test (d2q9, float, float-shift, false)	4m 7s
test (d2q9, double, same, true)	4m 44s
test (d2q9, double, same, false)	4m 4s
test (d2q9, double, half, true)	4m 21s
test (d2q9, double, half-shift, true)	5m 9s
test (d2q9, double, float, true)	4m 15s
test (d2q9, double, float, false)	4m 51s
test (d2q9, double, float-shift, true)	4m 42s
test (d2q9, double, float-shift, false)	3m 52s
test (d2q9, double, double, true)	4m 7s
test (d2q9, double, double, false)	4m 1s
	1h 18m 11s

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