[Rd] Changes in error reporting in r-devel

[brodie gaslam]

Minor issue, but the following changed as of R3.3.2 from:

    > a <- function() b()
    > a()
    Error in a() : could not find function "b"

To (at least in R Under development (unstable) (2016-11-20 r71670)):

    Error in b() : could not find function "b"

Notice the "Error in **b**() :" part.  The original error message seems more correct to me, although I can see how you can argue for either one.

Best regards,

B.