EBN fixes (kwallet)

[Alex Merry]

I split this into backend and client patches, because I'm thinking bc 
may only be an issue for the client part, in which case it's probably 
not worth changing the backend stuff (all marked @internal), and risk 
introducing bugs, as well as reducing readability etc.

I'd appreciate someone with knowledge of kwallet looking over it.  I did 
quite a bit of refactoring code to put private members in a d-pointer, 
and I don't claim to understand the code completely.  That said, it was 
largely mechanical work, I was reasonably thorough in checking the 
results of the substitutions by eye, and it all compiles fine, without 
any relevant warnings.  And the wallet seems to actually work.

Alex :-)
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