Log Message:
Import tex-pstricks-add-3.51 as graphics/tex-pstricks-add.

Collects together examples that have been posted to the pstricks mailing
list, together with many additional features for the basic pstricks,
pst-plot and pst-node, including: - bugfixes; - new options for the
pspicture environment; - arrows; - braces as node connection/linestyle;
- extended axes for plots (e.g., logarithm axes); - polar plots; -
plotting tangent lines of curves or functions; - solving and printing
differential equationd; - box plots; - matrix plots; and - pie charts.
The package makes use of PostScript routines provided by pst-math.