I think that submodules do what you want. And they may not be ready for
neophytes to just use, but they're ready for neophytes to try using and
tell us where things get confused. That is, I don't think git developers
know of anything still wrong with submodules, so we need people to try
using them and say "I can't use submodules now because...". Or, of course,
the code might be fine now and the discussion just too intimidating.
In any case, if you create a new repository, and fetch stuff into it, and
don't push stuff back, you can't screw up the original (obviously), so it
should be safe and possibly informative to play around with submodules.
-Daniel
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