FIX Users removed upon upgrade

FIX the bug that removed the orion user when updating from a previous version.
What if the script is called without parameters?
[ I don't even know if that is a possibility - might give an error before we get to this point ]
However, if this would happen, $1 evaluates to nothing and "if [ = 0 ]" is a parse error.
The fix is to put the left hand side inside double quotes:   if [ "$1" == "0" ].