[ctioga2] choice of global font size

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@477 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] increase default font size

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@478 86c91514-0d3b-42e0-aed1-4dfce116d947