Version Control minor mode.
This minor mode is automatically activated whenever you visit a file under
control of one of the revision control systems in `vc-handled-backends'.
VC commands are globally reachable under the prefix `C-x v':
key binding
--- -------
+ vc-update
= vc-diff
D vc-root-diff
I vc-log-incoming
L vc-print-root-log
O vc-log-outgoing
a vc-update-change-log
b vc-switch-backend
c vc-rollback
d vc-dir
g vc-annotate
h vc-insert-headers
i vc-register
l vc-print-log
m vc-merge
r vc-retrieve-tag
s vc-create-tag
u vc-revert
v vc-next-action
~ vc-revision-other-window