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This PR tracks derives_from orphans separately from parent relationship orphans
This PR also outputs derived_from orphans as separate features. this appears to match the spirit of the TAIR gff, which their "transposable element derived genes" in the TAIR gff would otherwise be hidden
fixes #4
not sure precisely how this meshes with the gff specification, derives from is used in different context there e.g. for the polycistronic gene https://github.com/The-Sequence-Ontology/Specifications/blob/master/gff3.md which is the canonical derives from
just as background, a polycistronic transcript basically encodes multiple genes from a single transcript e.g. the mRNA transcript is cut up into pieces that encode separate protein products