git-remote-annex will be a program that allows push/pull/clone of a git
repository to many types of git-annex special remote.

This is a redesign and reimplementation of git-remote-datalad-annex. 
It will be a safer implementation, will support incremental pushes, and
will be available to users who don't use datalad. 
--[[Joey]]

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This is implememented and working. Remaining todo list for it:

* When git clone is used with an annex:: url that is for a directory
  special remote and is missing directory=, for example, it does
  not display any useful error message. git fetch does, but it seems
  git clone eats git-remote-annex stderr.

* Cloning from an annex:: url with importtree=yes doesn't work
  (with or without exporttree=yes). This is because the ContentIdentifier
  db is not populated. It should be possible to work around this.

* datalad-annex supports cloning from the web special remote,
  using an url that contains the result of pushing to eg, a directory
  special remote.
  `datalad-annex::https://example.com?type=web&url={noquery}`
  Supporting something like this would be good.