* vc-git.el: (vc-directory-exclusion-list, vc-handled-backends):

* vc-git.el: (vc-directory-exclusion-list, vc-handled-backends):
Remove.
(vc-git-revision-completion-table): Enable.

* vc-hooks.el (vc-handled-backends): Add GIT and HG.

* vc.el (vc-directory-exclusion-list): Add .git and .hg.

* vc-hg.el (vc-hg-revision-completion-table): Re-enable.

* diff-mode.el (diff-mode-menu): New entries.

* diff-mode.el (diff-beginning-of-file-and-junk): New function.
(diff-file-kill): Use it.
(diff-beginning-of-hunk): Add arg `try-harder' using it.
(diff-restrict-view, diff-find-source-location, diff-refine-hunk):
Use it so they find the hunk even when we're in the file header.

* vc.el: Add new VC operation `revision-completion-table'.
(vc-default-revision-completion-table): New function.
(vc-version-diff, vc-version-other-window): Use it to provide
completion of revision names if the backend provides it.

* vc-arch.el (vc-arch--version-completion-table)
(vc-arch-revision-completion-table): New functions to provide
completion of revision names.

* vc-cvs.el: Require CL.
(vc-cvs-revision-table, vc-cvs-revision-completion-table):
New functions to provide completion of revision names.

* eval.c (init_eval_once): Bump max_lisp_eval_depth to 400.

* vc2-xtra.texi (Customizing VC): Add GIT and HG.