UID validity diagnostics improvement
UID validity diagnostics improvement


* Reduced the number of parameters passed to ui.validityproblem() because they were all just method-calls to the folder object, which is already passed as the first parameter (reduction of unnecessary complexity).

* Improved the diagnostic message for an 'UID validity problem' by including the name of the repository in which the folder resides; previously it was not possible to determine from the diagnostic alone on which side the problem was.

frioux/offlineimap,frioux/offlineimap