rname support for import_from_csv_file

[ilvalle]

I'd import a csv containing real database field name (dumped outside web2py).

db.define_table('test_1',
    Field('name', rname='firstname'))
import os
file_path = os.path.join(request.folder, 'test_1.csv')
db.test_1.import_from_csv_file(open(file_path, 'r'))
print db(db.test_1).select()
test_1.id,test_1.name
1,<NULL>
2,<NULL>

The content of test_1.csv is

"firstname"
Paolo
Luca

Without explicitly map the field names rname is not supported.