More new bits

[Matt Mackall]

Make undo and recover friendlier
Make fancyopts handle no arguments
Add tag/rev/node search to hgweb
hgweb: don't blow up on search for unknown keys
Hide most revision numbers in hgweb
hgweb: add tags links and manifest links
hgweb: actually commit the tags template
hg diff: fix missing final newline bug
trivial tweak to merge3
hgweb: alternating colors for multifile diffs
hgweb: make navigation of changesets a bit nicer
hg merge: abort if there are outstanding changes in the working directory


-- 
Mathematics is the supreme nostalgia of our time.