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A general description is here.
New ‘hcl.colors()’ function to provide wide range of HCL-based colour palettes with much better perceptual properties than the existing RGB/HSV-based palettes like ‘rainbow()’.
Also a new ‘hcl.pals()’ function to list available palette names for ‘hcl.colors()’.
Contributed by Achim Zeileis.
The default colours for ‘image()’ and ‘filled.contour()’ are now based on ‘hcl.colors()’.
The palette-generating functions ‘rainbow()’, ‘gray.colors()’, etc. get a new ‘rev’ argument to facilitate reversing the order of colors.
Support for ‘make install-strip’ has been enhanced.
The make macro ‘F_VISIBILITY’ is now preferred for both fixed-form and free-form Fortran, for use in ‘src/Makevars’ and similar.
‘R CMD INSTALL’ gains a new option ‘--strip’ which (where supported) strips installed shared object(s): this can also be achieved by setting the environment variable ‘_R_SHLIB_STRIP_’ to a true value.
The new option ‘--strip-lib’ attempts stripping of static and shared libraries installed under ‘lib’.
These are most useful on platforms using GNU ‘binutils’ (such as Linux) and compiling with ‘-g’ flags.
There is more support for installing UTF-8-encoded packages in a strict Latin-1 locale (and probably for other Latin locales): non-ASCII comments in R code (and ‘NAMESPACE’ files) are worked around better.