cubicweb #481716 when instance is started from cubes directory, we get ReST transformation errors.... [rejected]

in the log we can see

IOError: [Errno 2] No such file or directory: '/lib/python2.5/site-packages/docutils/writers/html4css1/html4css1.css'
prioritynormal
typebug
done in<not specified>
load0.000
load left0.000
closed by<not specified>