New collections package ready (almost)

[Jean-Philippe Bernardy]

Hello,

I've set up the new collections package, and it compiles under ghc and
hugs. I don't know about nhc, because I've been unable to compile nhc.
(I've got a x86_64 system; I've tryied to compile under a chroot does
not work, and configure program baffles me.) The non-ghc version is
portable though, so it _should_ work under nhc alright.

So, you can try to make "collections" a default package, so I can
start moving stuff out of "base" into it.

Cheers,
JP.