Alexander Neumann c8fc789393 Use non-formatting functions of errors for strings
Commands used:

    $ gofmt -w -r 'errors.Fatalf(x) -> errors.Fatal(x)' src
    $ gofmt -w -r 'errors.Errorf(x) -> errors.New(x)' src

Closes #789
2017-02-10 19:39:49 +01:00
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