Enable continuous GeM calculation. #1422

Job	Run time
build	21m 15s
forward-flux-sampling	19m 6s
abf-tip3p-water-ase	5m 15s
metad-alanine-dipeptide-openmm	4m 4s
abf-alanine-dipeptide-openmm	12m 11s
spectral-abf-alanine-dipeptide-openmm	4m 9s
alanine-dipeptide-openmm-mpi	8m 23s
alanine-dipeptide-string	8m 38s
cv-pucker-openmm-unbiased	3m 31s
metad-hoomd	5m 25s
openmm-nacl-metad-displacement	3m 43s
cff-butane-hoomd	4m 1s
harmonic-bias-hoomd	5m 8s
improved-string-hoomd	3m 33s
funn-butane-hoomd	4m 2s
umbrella-integration-hoomd	4m 11s
umbrella-integration-hoomd-mpi	3m 31s
unbiased-hoomd	3m 19s
	2h 3m 25s

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