rowid, similar to how things work in SQLite tables with INTEGER
PRIMARY KEY. Add tests to verify operation. (CVS 4426)
FossilOrigin-Name: c8d2345200f9ece1af712543982097d0b6f348c7
alias to fix the rowid for documents, %_segments.blockid is an alias
to fix the rowid for segment blocks. Unit test for the problem. (CVS 4280)
FossilOrigin-Name: 6eb2d74a8cfce322930f05c97d4ec255f3711efb