add_permission
Description:
Adds a permission to the connection's permission list.
 At this time, only the "user" permission type is supported, and pitem must be a username. See 
      permissions: for more details.
Parameters:
| this | |
| ptype | the permission type; at this time only "user" is supported | 
| pitem | the permission item formatted as required for  | 
| detail | unused at this time; must be null | 
Returns:
| true if the permission was unique and was successfully added to the list, 
              false if  |