Changes in version 2.4:

    o   Backported the pieGylph fix to the release branch.

Changes in version 2.3:

    o   Fixing bug in Graphviz on OpenBSD regarding sincos (Thanks to
	Rainer Hurling).

    o   Now using path.expand to fix tilde-expansion.

    o   We no longer include <R_ext/RConverters.h>; which seemingly was not
	needed (Thanks to Brian D. Ripley).

    o   Fix handling of fontsize attrib for nodes and edges (seems it has
	been broken at least since 2006).

Changes in version 2.2:

    o   Plotting now longer accepts border.lwd or border.col.  Instead of
	border.col use color.  Instead of border.lwd, you need to use the
	renderGraph/layoutGraph interface.  This fixes a long standing bug
	where Rgraphviz writes illegal dot files.  unitTest has been added.

    o   bugfix to renderNodes (used in renderGraph) for nodes with shape =
	"triangle".  It now works.

    o   bugfix to renderNodes (used in renderGraph) for using node-specific
	lwd and shapes either "triangle", "ellipse" or "circle".  It now
	works.

Changes in version 2.1:

    o   Rgraphviz now requires Graphviz >= 2.16.

    o   Added graphvizCapabilities() that reports the capabilities of
	Graphviz.  This requires Graphviz >= 2.28 and returns NULL if the
	Rgraphviz installation does not support it.

    o   Rgraphviz now comes bundled with Graphviz 2.28, greatly simplifying
	installation.

    o   Numerous bugfixes for bugs introduced in the 2.x.x versions.