missingArg correction in windrose function

[swmpkim]

Line 103 of cfData-plotMethods.R (the beginning of windrose ) should say:

if (missingArg(speed))

rather than:

  if (missingArg(direction))
    stop("speed can't be missing")

  if (missingArg(direction))
    stop("direction can't be missing")

[swmpkim]

I doubt this is worth a separate issue, but if you're modifying windrose for the above issue, there's also a minor typo on line 124; to be consistent with line 127 just add an 's' to speed:
stop("wind speeds need to be numeric")

I'm looking at this function so closely because I'm trying to improve functions that I write, and I've always liked making windroses from clifro. It's a really useful and well-written function; thanks!

[blasee]

Thanks @swmpkim!