convert: save hg revision during a convert
This breaks hg->hg hash roundtripping, but that was fragile, didn't work
reliably, and hence arguably of little value.
#!/bin/shmkdir acd ahg initecho foo > bhg add bhg ci -m "b" -d "1000000 0"chmod -w .hg/storecd ..hg clone a bchmod +w a/.hg/store # let test clean upcd bhg verify