WA_DEL

Purpose:        Deletes all watchers of the caller session

Input Syntax:   WA_DEL

Input Params:   none

Output Syntax:  [+|-]<message>

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

Right required: R_MONITOR

Implementation: f4adp_admin.c / f4adp_watch_del()

Remarks:        Watchers get automatically deleted when a session dies, this function needs
                not to be called in case of logout
