Add tag/rev/node search to hgweb

Make fancyopts handle no arguments This lets hg serve work with no args.

Make undo and recover friendlier Add them to the help display, have them report failure

Implement recover and undo commands This adds an interface to transaction to rollback with a given journal file and commands to rollback an existing .hg/journal or .hg/undo.

Simply repository locking This is a first pass at implementing repo locking. Next up, journal recovery and undo.

Update the README a bit

Add example CGI script This gives an example of how to easily use hgweb via CGI

Add 'hg serve' command for stand-alone server This adds a simple stand-alone web server mode to hg that exports the current repo for merging and browsing. The default port is 8000.

Install the templates where they can be found by hgweb.py This ought to use package_data but that doesn't exist in Python 2.3. So we do a hack of install_data and use glob. This also adds templatepath() to hgweb.py which finds the templates relative to hgweb.py's location.

Fix some broken parent links in hgweb