changed the interleave alert to "info" instead of "warn" when two different data types are present.
changed the interleave alert to "info" instead of "warn" when two different data types are present.

dtype is now chosen from intrinsic dtype hierarchy.

PMEAL/OpenPNM,stadelmanma/OpenPNM,amdouglas/OpenPNM,amdouglas/OpenPNM,TomTranter/OpenPNM