Encoding: Add self-assignment check to CommandLineArguments
Encoding: Add self-assignment check to CommandLineArguments

This was caught by the HP compiler warning:

 warning #4285-D: operator= does not have a check for the source and
 destination addresses being non-identical

Change-Id: I074a33410402b2b872dee03df3d4006ffe32f111

chuckatkins/KWSys,chuckatkins/KWSys,chuckatkins/KWSys,chuckatkins/KWSys