[Rd] variance of a scalar (PR#546)

[J.C.Rougier@durham.ac.uk]

I was surprised to find that the variance of a scalar, using
var(), is NA.  Surely this should be zero?

Cheers, Jonathan.

--please do not edit the information below--

Version:
 platform = sparc-sun-solaris2.7
 arch = sparc
 os = solaris2.7
 system = sparc, solaris2.7
 status = Patched
 major = 0
 minor = 99.0
 year = 2000
 month = February
 day = 9
 language = R

Search Path:
 .GlobalEnv, package:HistoryMatch, package:zmatrix, package:stepfun, package:Simulator, Autoloads, package:base

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