Combined locus/loci, info objects for genes & transcripts, reconstruct missing entries & columns for old releases

Ah you're right, it turns out I was confused. I assumed assert was like print and became a regular function (requiring parens) in Python 3, but turns out it's special and should not have parens in Python 3 (in fact it *must* not have parens if you use the two argument version, since then you'd be passing in a tuple, which is always true). So my comment about being Python 3 ready is really only about print statements, not asserts.