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A general description is here.
The ‘yLineBias’ of the ‘windows()’ family of devices has been changed from 0.1 to 0.2: this changes slightly the vertical positioning of text (including axis annotations). This can be overridden by setting the new ‘"ylbias"’ graphical parameter.
There is support for ‘multilib’ toolchains which use options ‘--m32’ or ‘--m64’ to select the architecture; set the appropriate macros in ‘MkRules.local’.
It is the intention to move to such a toolchain when they become mature enough.
‘shell.exec()’ now interprets files relative to the current working directory (rather than ‘R_HOME’).