Add DNADNANet base class for all network models
This is to follow up on what I wrote in this comment that there should be a base class for nets.
It defines schema = {}
by default, so it's not absolutely required to specify a schema for their params.
This also factors out some of the other changes surrounding nets from !24 (merged) so they can be examined and discussed independently from the discussion of prediction.
TODO:
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This would also be a good place to address issue #51 (closed)
Edited by E. Madison Bray