Better error throwing and ID sequences

[Sebastian Spaeth]

On Wed, 17 Aug 2011 20:52:24 +0200, Nicolas Sebrecht <nicolas.s-dev at laposte.net> wrote:
> The topic looks good but I had error to merge it. I tried each commit
> since the bumped imaplib2 merge.

I just rebased to current next branch without conflicts. Weird. In any
case, here comes the updated patch series as a reply.

Sebastian
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