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	-) Use CCM when 1 to 1 is impossible
	-) Check cavity is closed in the cavity check algo
	-) Better Info/Warning messages 

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method to make generators of H1 and H2 prettier (more to come!).

for reporting the bug)

(useful for large datasets with number of components != 1, 3 or 6,
for which doing Plugin(Extract) would be too expensive)