New graphic objects in package draw



Hello,

Two new 2d graphic objects were added to package draw:

- region
plots regions defined by inequalities. Examples in
http://www.telefonica.net/web2/biomates/maxima/gpdraw/region

- errors
error bars and boxes for empirical data. Examples in
http://www.telefonica.net/web2/biomates/maxima/gpdraw/errors

I hope you'll find them useful.

--
Mario