USR_PWD

Purpose:        Changes user's password

Input Syntax:   USR_PWD <name> [<password>]

Input Params:   name       CHAR(10)  = username
                password   CHAR(10)  = new password

Output Syntax:  [+|-]<message>

Output Params:  message    CHAR(128) = human-readable message

Right required: R_USER_PASSWD

Implementation: f4adp_user.c / f4adp_usr_pwd()

Remarks:        Clears password, if none is given
