Show incorrect mock calls globally

[lindycoder]

When a mock call doesn't meet its expecation, the error is put on stdout during the call.

So when this code happens:

var=$(mocked-command)

then $var has the error "Unexpected call..." so it's hard to debug and see the problem

[mat128]

Solved by #29, errors are (now) reported on a different channel (the mocks workspace) :)