exponents on floating points with decimals, but no mantissa
This update to math.py adds a list of only those functions contained
within package:base, output from R with via the builtins(TRUE)
function. Keywords for Keyword.Constant, Keyword.Namespace, and
Keyword.Type were manually subsetted from the resulting list. This is
the approach used by the Mathematica and Numpy lexers.
The update to test.R adds a sample of the builtin functions, data
structures, and namespace functions, along with an example of a floating
point with a decimal, but no fractional part.