Diff for "BranchPlan"

• 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

• if a branch is set, update should update to the tip of the current branch

• merging a branch that's descended from the current branch should fast-forward

Need more smarts for the following commands:

• heads <branch> should show all heads of that branch

• updating to a revision on a different branch should require a merge
• log should have an option to show the history of a single branch, stopping at its fork point
• Need a way to close inactive branches. One possibility: have a special branch name like 'inactive', and commit to that branch on top of the branch you want to close. Then have hg log et al. ignore any branches which are parents of any 'inactive' revisions by default.