WP-34S: Safely copy a graphics register's contents

[Dave Britten]

Ah, R-COPY should be the secret ingredient I need. Currently the program happens to be running in BASE 10 64-bit word size when it does the STO/RCL, so it appears to work fine, but I'll change it to the safer method. Looks like I just need to call 1.01 R-COPY to do the job.