[ctioga2] introduce a gnuplot colorset

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@467 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] implement the xy: fill style

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@468 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] make text conversion to float a bit more lenient

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@469 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] make auto legends a little more looking like auto legends

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@470 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] improve TeX quoting for auto legends

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@471 86c91514-0d3b-42e0-aed1-4dfce116d947