Add support for import tree

[Lykos153]

We need to detect changes in export remotes to support git annex import treeish

[andrewringler]

Would this support the following workflow?

I have a local annex folder and have a bunch of files in it. I have git-annex export --tracking setup on a Google Drive special remote (without encryption), so every-time I do a git-annex sync --content any local changes are pushed up to Google Drive. I can then see these files in a nice directory structure at https://drive.google.com/ and download them if I need to.

Now, I also want to be able to upload, change files, rename folders from the web interface at https://drive.google.com/. So I do that, then after I am done, I run git-annex import to bring in all of these changes.

Is this one of the motivations for git annex import?

[Lykos153]

Yep, that's the idea!

[andrewringler]

Super!