More updates for VC documentation.
* doc/emacs/maintaining.texi (VCS Concepts): Add "working tree" terminology. (Old Revisions): Use it. (VCS Repositories): Add "distributed" terminology. (Log Buffer): Remove duplicate description about changesets. Fix "current VC fileset" ambiguity. (Multi-User Branching): Node deleted. (Branches, Switching Branches): Discuss decentralized version control systems. (VC Pull): New node. (Merging): Document merging on decentralized systems. (Creating Branches): Note that this is specific to CVS and related systems.
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