Patch for error handling / separation of accounts etc.

[Mike Dawson <mike@xxxxxxxxxxxxxxxxx>]

Dear All,
I have made the attached patch to try and make offlineimap a bit more 
stable in challenging situations.  It's extremely useful in slow 
connection environments - but sometimes if one account had the wrong 
password or the connection went down then unfortunately the whole 
program would crash.

I have tested this on our connection and tried throwing at it just about 
every situation - connection, up down, up, down again, change password, 
error whilst copying one message, etc.  I have been running this patch 
for the last 5 days or so syncing 6 accounts at the moment...  It seems 
to work and stay alive nicely (even if your connection does not)...

Hope that this can go in for the next release... Please let me know if 
anyone notices any problems with this...

Regards,

-Mike



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