improve form_view. When you use EditorField with FCKEditor, don't escape some characters like '>', '<'. And if you use EditorField with text_area, escape the characters.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@24250 20353a03-c40f-0410-a6d1-a30d3c3de9de