Changes to base(2)

Changes to base:
commit 09baac2e6911d6559e66ec6d76233ca70ce762da
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Wed Jan 29 16:25:15 2014 +0100

    Update `changelog.md` to contain more changes

    Some important changes might still be missing from the changelog.

    Also, `base.cabal` is updated to include `changelog.md` in the
    `cabal sdist` tarball.

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

commit f6a3a9a199c94a02e45977f0042548b956adf12f
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Wed Jan 29 16:23:44 2014 +0100

    Add `/Since: 4.7.0.0/` to `MkFixed` constructor

    As it's been exposed only since
    05c03d850a7da7bd708e9a9da7de2b9ba36b6041

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>