Initial support for unified DVCS pull and merge.
* lisp/vc/vc-bzr.el (vc-bzr-admin-branchconf, vc-bzr-history): New vars. (vc-bzr--branch-conf, vc-bzr-async-command, vc-bzr-pull) (vc-bzr-merge-branch): New functions, implementing merge-branch and pull operations. * lisp/vc/vc.el (vc-merge): Use vc-BACKEND-merge-branch if available. Accept optional prefix arg meaning to prompt for a command. (vc-update): Use vc-BACKEND-pull if available. Accept optional prefix arg meaning to prompt for a command. (vc-pull): Alias for vc-update.
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