Presorting data with GSSort

Since GSSort knows how to read the GS data as well as external data, it might be useful to presort data with the utility. Even perhaps use the gating capabilities of GSSort to determine what to write to the skimmed data files, besides just modifying the data format.

It is possible to do that using the Userxxxx.h files. Below is an example that presorts your data into a very simple format -- which you might use as a starting point for your own skimming/presorting.

UserDeclare.h || UserInit.h || UserEv.h || UserExit.h