Add --legaltag to the command line options for zgycopyc
Add --legaltag to the command line options for zgycopyc.
The code is backported from the SLB-Internal ZgyTool.
To copy the output tag from the input, use '--legaltag=*'.
Copying involves an extra open/close of the input.
That might be fixed someday.
The default legaltag is '', i.e. use the project default.
This differs from ZgyTool which defaults to '*'.