Reconstruction of the SYSSRPM file

A reconstruction affects not only the user catalog but also the TSOSCAT file catalog because the file catalog keeps a separate list of user IDs which is used for mapping user IDs to PBNs (the primary block number identifies the file owner). The reconstruction must preserve the consistency of the user catalog and file catalog. The user structure of the existing user catalog SYSSRPM is not included in the reconstruction process.

Ideally, a pubset should be reconstructed with its own backup. If this is not the case, there can be inconsistencies between the system environments at saving and reconstruction.

The aim is to unite the two user structures of .BACKUP and TSOSCAT, at the same time eliminating any inconsistencies.