[development] Let's kill $user->data

[Karoly Negyesi]

Hi,

Two steps

a) We remove $user->data handling code from D6 core. No save, no load. New  
installs won't have this column.
b) D7 will drop the $user->data if it exists. (SELECT * FROM user,  
$account = db_fetch_array, if(isset($account['data'])) -- no need for DDL  
to check for a column).

This way D6 contribs can clean up $user->data and migrate to their own  
tables.

Regards

NK