[ctioga2] provide a way to position ticks outside (or even on both sides)

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@376 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] display of legends for parametric plots

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@377 86c91514-0d3b-42e0-aed1-4dfce116d947