[ctioga2] implement multicolumn legends

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@378 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] make it possible to chose the output directory for test PNG files

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@379 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] implement tests for the new legend tiling possibilities !

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@380 86c91514-0d3b-42e0-aed1-4dfce116d947