Implement --recorded-root, fixes #1351

[bkabrda]

A --recorded-root install argument as discussed in #1351.

[dstufft]

How important is this to you for 6.0 @bkabrda?

I ask because I think I might prefer switching this around and behaving more like a traditional Makefile where you do something like pip install --prefix /usr/ --destination /tmp/dir or something like that.

[dstufft]

To be specific, I ask because I'm trying to prioritize whether to get something in or wait until we can get it just right.

[bkabrda]

Well, for our packaging use we can always include this as a downstream patch (we do now). So it's not absolutely necessary (although it's always nice to not diverge from upstream, so accepting this would be appreciated :)).

[dstufft]

ok!

[dstufft]

Accidentally closed this, reopening. Sorry!

[BrownTruck]

Hello!

As part of an effort to ease the contribution process and adopt a more standard workflow pip has switched to doing development on the master branch. However, this Pull Request was made against the develop branch so it will need to be resubmitted against master. Unfortunately, this pull request does not cleanly merge against the current master branch.

If you do nothing, this Pull Request will be automatically closed by @BrownTruck since it cannot be merged.

If this pull request is still valid, please rebase it against master (or merge master into it) and resubmit it against the master branch, closing and referencing the original Pull Request.

If you choose to rebase/merge and resubmit this Pull Request, here is an example message that you can copy and paste:

A --recorded-root install argument as discussed in #1351.

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*This was migrated from pypa/pip#2117 to reparent it to the ``master`` branch. Please see original pull request for any previous discussion.*

[BrownTruck]

This Pull Request was closed because it cannot be automatically reparented to the master branch and it appears to have bit rotted.

Please feel free to re-open it or re-submit it if it is still valid and you have rebased it onto master or merged master into it.