Better error throwing and ID sequences

[Sebastian Spaeth]

On Fri, 19 Aug 2011 18:47:08 +0200, Nicolas Sebrecht wrote:
> It introduces a bug:
> 
> ERROR: Exceptions occurred during the run!
>  ERROR: Aborting folder sync 'INBOX.ABUL' [acc: 'nis']
>   FETCHING UIDs in folder [Remotenis]INBOX.ABUL failed. Server responded
> '[NO] ['No matching messages']'

OK, lets take this topic with caution then. Here are the first two
patches of the series which do not change any behavior but code cleanup
and nicer log messages.

Once we have that in we can work with the changes that introduce
breakages.

2patch series as reply.

Sebastian
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