Fixed #1: Demo smi32 fails due to polarplot not working

polarplot() has been replaced by projection() but this has not been
reflected in this demo.

git-svn-id: svn+ssh://r-forge.r-project.org/svnroot/retistruct@1351 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Only call delaunayn for >3 points in getDssHullarea to prevent error

git-svn-id: svn+ssh://r-forge.r-project.org/svnroot/retistruct@1352 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added namespace to gWidgets calls to fix checks

git-svn-id: svn+ssh://r-forge.r-project.org/svnroot/retistruct@1353 edb9625f-4e0d-4859-8d74-9fd3b1da38cb