GENE — association from FeatureExtraction to QuantitationTypeMapping needed

Currently, if software, for instance, calculates a Ratio
from two channel images, there is no direct way to record how it was
derived, other than burying it in the protocol.

Request from Michael Miller, Rosetta Biosoftware, that there be an
association from FeatureExtraction to QuantitationTypeMapping.
The association would have the same names and characteristics as
the Transformation to QuantitationTypeMapping Mapping association
with a constraint of "rank: 3" on the QuantitationTypeMapping end.
This association would allow a natural way to describe additional
work of FeatureExtraction beyond reading the image.

(MAGE ISSUE 109)

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