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A general description is here.
The progress bar in download.file() is now supressed by quiet=TRUE (as it has long been on Unix).
We now preassume version 2.7.0 of Rtools.exe, in which gcc is version 4.2.1.
We now assume Tcl/Tk version 8.5.x (included in version 2.7.0 of Rtools.exe). Earlier versions can be selected in MkRules. The distribution in Rtools (and hence in the binary installer) includes the BWidget and Tktable extensions.
LazyLoad: yes is now the default, so packages wanting to avoid lazy loading must set LazyLoad: no (or an equivalent value).
package.skeleton() now handles S4 classes and methods, producing documentation and NAMESPACE exports if requested.
'methods' package functions getAccess(), getAllMethods(), getClassName(), getClassPackage(), getExtends(), getProperties(), getPrototype(), getSubclasses, getVirtual(), mlistMetaName(), removeMethodsObject() and seemsS4Object() are defunct.
In package installation, SaveImage: yes is now ignored, and any use of the field will give a warning.
Use in packages of the graphics headers Rdevices.h and Rgraphics.h is defunct: they are no longer installed.
xdg-open (the freedesktop.org interface to kfmclient/gnome-open/...) is considered as a possible browser, after real browsers such as firefox, mozilla and opera.
setAs() now catches 2 arguments in the method definition, if they do not match the arguments of coerce().
Methods with missing arguments in the definition are handled correctly when non-signature arguments exist, and check for conflicting local names in the method definition.
dbeta(.., ncp) is now more accurate for large ncp.
qgamma() and qchisq() could be inaccuarate for small p, e.g. qgamma(1.2e-10, shape = 19) was 2.52 rather than 2.73.
setAs() now catches 2 arguments in the method definition, if
they do not match the arguments of coerce().
Methods with missing arguments in the definition are handled
correctly when non-signature arguments exist, and check for
conflicting local names in the method definition.