Migrate printing.py to new API
Migrate res_users.py to new API
Migrate report_xml_action.py to new API
Migrate wizard/update_printers.py to new API
Better view for wizard
Recursion when calling a method with old-style api signature from browse
Remove the Lock because it is useless on multiprocess

Replace it by a database lock so the different processes are
all aware of the lock and the last update timestamp.
browse is called often enough to call the update routine (even too much)
Implements the print on the new 'report' model
Restore the print capability on deprecated reports
Update copyrights
Improve form view, add search view for printers