Reads the attribute config values from .rootstylerc.
.rootstylerc
If the style entry is not found there, tries ~/.rootstylerc and finally $ROOTSYS/etc/system.rootstylerc.
~/.rootstylerc
$ROOTSYS/etc/system.rootstylerc
#include </home/sftnight/build/workspace/root-makedoc-v618/rootspi/rdoc/src/v6-18-00-patches/graf2d/gpadv7/v7/src/RStyleReader.hxx>