[web2py] fields and field_labels argument in crud.seach

[niknok]

This example from the epydoc doesn't work: 

        form, results = crud.search(db.test,
                               queries = ['equals', 'not equal', 'contains'],
                               query_labels={'equals':'Equals',
                                             'not equal':'Not equal'},
                               fields = [db.test.id, db.test.children],
                               field_labels = {'id':'ID','children':'Children'},
                               zero='Please choose',
                               query = (db.test.id > 0)&(db.test.id != 3) )



However, it will work if I change the fields argument to: 

        fields = ['id', 'children']


In the book though the latter convention is but I often refer to epydoc
when I'm offline. 



I also couldn't get the field_labels to show up with crud.search as
above.