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We were mixing up the *implicit* import of Prelude
with a user-written import declaration

By filtering out the --rebase when fetching submodules

Apparently .git can be a file rather than a directory in some cases

It wasn't handling new submodules appearing

This bring the time package into line with how we handle other
packages.

Leave it to 'git submodule init/update'

Based on a patch from Thorkil Naur.

As per a request from Simon PJ, I wrote up a formalism of the core
language in GHC, System FC. The writeup lives in docs/core-spec.
I also added comments to a number of files dealing with the core
language reminding authors to update the formalism when updating the
code. In the next commit will be a README file in docs/core-spec
with more details of how to do this.

The default behavior of :info is to show only those instances of
for a type, where all relevant type constructor names are in scope.
This keeps down the number of instances shown to the user.

In some cases, it is nice to be able to see all instances for a type.
This patch implements this with the :info! command.

Based on patch from Peter Trommler:

    From 293495d40f62e691520331a41c6d85d82e120169 Mon Sep 17 00:00:00 2001
    From: Peter Trommler <ptrommler@acm.org>
    Date: Sun, 21 Oct 2012 18:47:01 +0200
    Subject: [PATCH] Add configure option to use system provided libffi This
     fixes track # 5743 and #4496.

It looks like it would fail anyway, as it 'show'ed its argument before
passing it on to printf.