BranchPlan - Mercurial

extend changelog format to allow storing new attributes
add a .hg/branch file to indicate the branch name in the working directory
read the .hg/branch file on commit
update the .hg/branch file on checkout
leave it alone on merge (we stay on the current branch)
add a branchtags() function to localrepo with a cache
teach lookup about branch names
teach log and friends about branch names
teach hg id about branch names
get hg pull -r <branch> working
add a command to show all existing branches
add a command to change the current branch
deprecate old -b options
teach hgweb about branch names
teach merge to do fast forward (one branch start point is the last cset of the other, so we don't have multiples heads and just need to update the branch name)