Table: replace Table references with cls or self.__class__
Table: replace Table references with cls or self.__class__

Plays more nicely with subtypes.

qPCR4vir/orange3,cheral/orange3,kwikadi/orange3,qPCR4vir/orange3,kwikadi/orange3,cheral/orange3,cheral/orange3,kwikadi/orange3,cheral/orange3,qPCR4vir/orange3,kwikadi/orange3,cheral/orange3,qPCR4vir/orange3,qPCR4vir/orange3,kwikadi/orange3,cheral/orange3,qPCR4vir/orange3,kwikadi/orange3