[ctioga2] customize more details about the legends

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@387 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] give number of points in show-stack() too

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@388 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] a drop command to drop datasets from the stack

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@389 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] put back the stored_dataset function that was used, after all ;-)...

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@390 86c91514-0d3b-42e0-aed1-4dfce116d947