CRAN Release 2.9.0

NEW FEATURES AND SIGNIFICANT CHANGES

Added a new function simulate_spec(), which allows for the flexible simulation of naturalistic spectra (inc. reflectance, irradiance, radiance, absorbance). See ?simulate_spec for examples and information, and the handbook for further discussion.
plot.rspec() now accepts a logical labels argument (and labels.cex), to control whether text labels identifying each spectrum should be added to the outer plot margins. This was previously only available, and was required, for 'stacked' plot types, but is now optional for both 'overlay' (the default) and 'stacked' spectral plots.
the wlmin and wlmax arguments in summary.rspec() are being deprecated in favour of a single lim argument, for consistency across functions.

summary.rspec() has been rewritten for efficiency, and now only calculates the required variables when subset is used. As a result, the function is also slightly slower (0.5 x) when calculating the full set of variables, but much faster (10 x) when calculating a subset.
Removed the start-up message.
Removed the previously-deprecated margins argument from various colourspace plots.
Replace rgl.triangles with triangles3d() internally to avoid a deprecation issue.
Fixed a bug in the categorical colourspace, so it now returns sensible category values when x and/or y is equal to 0.