Remove isamd. It's not been in use for a long time and isamb is better in most cases. Change SYSNO to be zint. Change pointers in isamc and isamb to zint. Change block number in bfile/cfile to zint. zint is a long integer (64-bit). This change practially removes register limits for Zebra. Implement int-list encoding for ISAMs.
All sorts of new stuff and modifications in the attempt -- so far unsuccessful and perhaps ultimately doomed -- to wedge the Zthes taxonomy model into a Zebra configuration.