fix the cat command
- improve localrepo.walk when passed a node
- make the differents walk commands in commands.py accept a node
- change commands.cat to walk over a revision
- add a test
#!/bin/shmkdir acd ahg initecho foo > bhg add bhg ci -m "b" -d "0 0"chmod -w .hgcd ..hg clone a bcd bhg verifycd ..chmod +w a/.hg # let test clean up