Make test-convert-mtn pass on systems where mtn add -R uses different order

Add ancestors and descendants to revlog This patch adds two methods to revlog: - ancestors: given a list of revisions returns their ancestors - descendants: given a list of revisions return their descendants

mdiff: compare content of binary files directly A plain Python string comparison stops when the first mismatch is found, whereas the call to md5 would need to compute the hash over the entire string and only then do the comparison.

merge with crew-stable

Make test-hardlinks-safety repeatable and executable

convert: Fix debugging output when running multiple commands with xargs.

keyword: add verify to nokwcommands after refactor in e79a8f36c2a5 Add test as well. Thanks to Guy Brand for spotting this.

merge with crew-stable

Let the notify extension use [diff] options too.

coal/paper: fixed box via an expression for IE < 7