Changed some internals of Calendar/DateField, so they are easier to extend and to change image sources/month names/day names
Changed some internals of Calendar/DateField, so they are easier to extend and
to change image sources/month names/day names


git-svn-id: 6db40d0534cac73ba019dccfebee869402ecad0c@2379 7a2bd370-bda8-463c-979e-2900ccfb811e

certik/pyjamas,certik/pyjamas,certik/pyjamas,certik/pyjamas