Proposal: Change to library proposal process

[Ian Lynagh]

Here's a refinement based on feedback so far:

The proposal process would change to:

Start: Send a mail to libraries@, with subject beginning "Proposal:",
       containing details of the change and a proposed deadline
       (at least 2 weeks time).

       A link to a patch implementing the change should be included.
       Patches may be hosted anywhere, e.g. on community.haskell.org.
       If small (< 20k) it should also be attached to the mailing list
       message for convenience.

End: If consensus for the change has been reached, file a ticket in the
     GHC trac, including:
     * A link to the start of the thread in the archives
     * Details of the change
     * A summary of the discussion
     * A patch to implement the change


Thanks
Ian