help: improve wording of update help text

hgrc.5: oft-requested "hg update" hook example

convert/svn: delegate to svn bindings if HTTP probe fails convert extension tries to guess the remote repository type with HTTP probes. Unfortunately, it does not handle authentication or HTTPS handshakes, so regular svn repositories may be excluded. Instead, when a non-404 error is retrieved, we keep trying with the svn bindings. The drawback is missing svn bindings will make the conversion to fail even for non-svn targets. This can be avoided with --source.

test-rebase-newancestor: make executable

mdiff: fix diff -b/B/w on mixed whitespace hunks (issue127) Previous code was computing hunks then checking if these hunks could be ignored when taking whitespace/blank-lines options in accounts. This approach is simple but fails with hunks containing both whitespace and non-whitespace changes, the whole hunk is emitted while it can be mostly made of whitespace. The new version normalize the whitespaces before hunk generation, and test for blank-lines afterwards.

contrib/perf: profile diff of working directory changes

dispatch: better error message for --config option

mq: fix literal blocks in docstrings

convert/mtn: handle change in mtn 0.45 certs output

merge with crew