[ctioga2] make it easy to deprecate options, and in particular style options

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@383 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] finally a decent implementation of size for legends

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@384 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] and a new test for it

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@385 86c91514-0d3b-42e0-aed1-4dfce116d947
[ctioga2] fix very nasty bug coming from tioga' context not always restoring expected values ;-)...

git-svn-id: svn+ssh://rubyforge.org/var/svn/ctioga2/trunk/ctioga2@386 86c91514-0d3b-42e0-aed1-4dfce116d947