Add '-' support to the commit logfile option to read message from stdin.

Add searching for named branches named branching is when you identify a head by a tag on an earlier revision. This patch adds repo.branchlookup for searching through the tree to find branch tags for heads. hg update -b tag is added to checkout based on branch tags hg heads -b is added to print the tag associated with each head

Fix bug with empty inc and exc This fixes an exception that showed up when importing patches

Merge with BOS

Merge walk changes with Matt's tip.

Merge with TAH.

Turn off testing of absolute paths for now. I don't know how to stop this from always reporting false errors, and am too lazy to worry about it right now.

Fix bug involving "hg debugwalk -Ipattern" from repository root.

Fix clone when target directory is relative.

Merge walk fixes.

Add unit tests for walk code.

Fix up handling of regexp paths.

Merge Windows path fixes.

Fix walk path handling on Windows

Merge latest round of walk fixes.

Fix walk code for files that do not exist anywhere, and unhandled types. Prior to this, a file that did not exist was reported as showing up in the filesystem, as were files of unsupported types (such as fifos). Now, an error message is printed and nothing is returned in such cases. This change also moves the commands.pathto function to the util module, as the walk code needs it to print non-confusing error messages.