Get NATURAL version information for all objects on FUSER

The attached program uses USR1054N, USR1055N, and USR2018N to extract the NATURAL version number that was used to SAVE the source code and CATALOG the object code in the FUSER file.

For example, it can be used to find all NATURAL version 2.1 objects in the FUSER file. These objects are incompatible with NATURAL version 4.