pos file schema

[bdice]

Original report by Matthew Spellings (Bitbucket: mspells, GitHub: klarh).

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It would be straightforward to store pos file frames as a discretely-varying quantity like "frames/x/injavis.pos". We could also have a zip2pos (and pos2zip?) module[s] (or integrate the functionality into gtar.copy) in the gtar library and give injavis the ability to read zip files of this schema (which should be pretty easy using java's builtin zip archive library, as far as I know).