Catch errors in __str__ for process.  Linux psutil can cuse access denied for system processes. Comment demo code at the bottom of psutil.py.  No longer works.
Catch errors in __str__ for process.  Linux psutil can cuse access denied for system processes.
Comment demo code at the bottom of psutil.py.  No longer works.

ztop/psutil,ztop/psutil,ztop/psutil,ztop/psutil