Added support for an external validation function to be added to the list of validators for a given field.
Added support for an external validation function to be added to the list of validators for a given field.

git-svn-id: 7fda057ee2aaa28daf1fdf85c70fa8a3d873e8ca@6 05a48904-4b55-0410-ac7d-d94522421892

ntentan/ntentan