Create exception when file rename fails
Create exception when file rename fails

Signed-off-by: Vladimir Marek <6ff020451b01defc7414c8af208974d97975c76e@volny.cz>
Signed-off-by: Nicolas Sebrecht <347709267ddd1958560c4c317ea3fd613f10a719@laposte.net>

frioux/offlineimap,frioux/offlineimap