2011 Jan 7: Pyxplot 0.8.4
This is a minor bugfix release.
Two-dimensional parametric grid plotting implemented.
Bugfix to the dots plot style; filled triangles replaces with filled circles.
Bugfix to linewidths used when drawing line icons on graph legends.
Bugfix to Makefile to ensure libraries link correctly under Red Hat and SUSE.
Code cleanup to ensure correct compilation with -O2 optimisation.