[ctioga2] fix double constant initialization warning

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@517 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] shortcut for reading CSV files

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@518 86c91514-0d3b-42e0-aed1-4dfce116d947