Add simple functions to map errors

The mechglue stores a map of errors/mech oids, this means that we should never
return the same error we got from a mechanism after re-entering the mechglue as
we then may get the mechglue confused and prevent us from asking an interposed
mech for the error. Also we want to try to aqvoid collisions from errors
returned from the proxy, as they could end up fetching errors from the wrong
mechanism.
For now just make a very simple mapping by always adding a special error base.

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