[ctioga2] cope with figure names containing dots and spaces

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@449 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] simplify the name of math-generated datasets

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@450 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] only split on : outside nested parentheses, which allow the use of ( ? : ) within the specs

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@451 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] implement the /path-style=impulses, like in gnuplot

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@462 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] advanced fill styles (similar to gnuplot)

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@466 86c91514-0d3b-42e0-aed1-4dfce116d947