More precise error messages for mutate() et al.

[krlmlr]

When propagating an error from the R interpreter, we should mention specifically what caused the error, because the messages may not be very helpful, as in this SO example where the cause is a mistyped column name but error is simply:

Error in mutate_impl(.data, dots): cannot coerce type 'closure' to vector of type 'double'

Instead, the error message should be more like:

Error: mutate(..., id = as.numeric(id)) cannot be evaluated, cannot coerce type 'closure' to vector of type 'double'

[romainfrancois]

duplicate of #3510

[lock]

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