1. (LINUX) Fix various problems in DISAM (lib version now changed to 6.11c): A. If you opened a file twice, it aborted on 2nd close. B. It was not handling the in-use condition properly.
2. (UNIX) Zombies were being left on telnet disconnects.
3. (UNIX) Signal tracing was not working properly. If TRACE=SIGHUP, now tracing messages to to $MIAME/ashell.log as in version 4.5.
4. XCALL CONDEV,CONDEV$ now implemented. Returns a string which may be used to identify the client machine. If the IP address is available, the CONDEV$ string will be of the form "#.#.#.#". For Windows, it will be the machine name (without the: and window number as GETUSN returns.) Otherwise it will be the tty device name.
