Linking abnormal morphologies through developmental time

[JoshuaFortriede]

Because Xenopus uses a lot of early embryonic tissues, it is appropriate to have XPO terms such as abnormal optic field morphology. While this phenotype does not 100% guarantee an abnormal eye morphology (the final developmental tissue of the optic field), it "most likely causes" abnormal eye morphology. It would be helpful to have these terms linked somehow so that graph paths, and searches based on these graph paths will return these terms appropriately.