unpacking and repacking of intermediate paths.

  they cause Nix builds to have unnecessary retained dependences
  (e.g., on Subversion).

  makes most query and installation operations much faster (e.g.,
  `nix-env -qa' on the current Nixpkgs is about 10 times faster).

* Make the `derivation' primitive much more lazy.  The expression
  `derivation attrs' now evaluates to (essentially)

    attrs // {
      type = "derivation";
      outPath = derivation! attrs;
      drvPath = derivation! attrs;
    }

  where `derivation!' is a primop that does the actual derivation
  instantiation (i.e., it does what `derivation' used to do).  The
  advantage is that it allows commands such as `nix-env -qa' and
  `nix-env -i' to be much faster since they no longer need to
  instantiate all derivations, just the `name' attribute.  (However,
  `nix-env' doesn't yet take advantage of this since it still always
  evaluates the `outPath' and `drvPath' attributes).

  Also, this allows derivations to cyclically reference each other,
  for example,

    webServer = derivation {
      ...
      hostName = "svn.cs.uu.nl";
      services = [svnService];
    };

    svnService = derivation {
      ...
      hostName = webServer.hostName;
    };

  Previously, this would yield a black hole (infinite recursion).

  also part of ISO C).

* `compare' in GCC 2.95 is broken.

  should not have worked at all.

  template friends.

  compatibility fix.

  make (such as FreeBSD).

* Add support for the creation of shared libraries to `compileC',
  `link', and `makeLibrary'.
* Enable the ATerm library to be made into a shared library.

  - Add __currentTime primitive (dangerous!).
  - Allow imports of derivations.

  `--isvalid' flag in nix-store.

  (but substitutable) referers.

  database isn't always in the manifest (so the reference graph cannot
  be reconstructed fully).

  options were documented, as well as the Nix configuration file.

  any store path).

  copy them, but use them directly.