3.4.27 `out-push-new' - purge and create output file

Usage: (out-push-new [ file-name ])
Leave the current output file open, but purge and create a new file that will remain open until a pop delete or switch closes it. The file name is optional and, if omitted, the output will be sent to a temporary file that will be deleted when it is closed. See section 3.7 Redirecting Output.

Arguments:
file-name - Optional - name of the file to create