please come up with "overlay" versioning scheme (e.g. in ds 201) #9

[vsoch]

Moving issue poldrack/openfmri#9 (comment) to the proper board, involving @chrisfilo @jbwexler @yarikoptic @poldrack

@jbwexler - that seems like a simple and suitable solution, and likely the only issue someone would have is redundancy of files. If there is a huge nasty file, for which duplicating is annoying/an issue, you can easily just make a symbolic link between the two versions. This would of course be problematic if the other file breaks, etc, but maybe there could be tests/some tool to ensure that changes don't break dependencies.

At the end of the day, a user wanting a certain version should 1) have an easy way to get it, and 2) have transparency of the file naming. The easiest solution that doesn't require additional testing or tools is just copying and renaming, at the time when it's needed, and then it's done, so I think maybe it makes sense to start with that until there is reason to do something more complicated.