Fix viper undo breakage from undo-boundary changes
* lisp/simple.el (undo-auto-disable-boundaries): New variable
* lisp/emulation/viper-init.el (viper-undo-in-complex-command,
viper-undo-needs-adjustment): Rename
variable to reflect new purpose,
(viper-buffer-undo-list-mark): Remove
* lisp/emulation/viper-cmd.el (viper-set-complex-command-for-undo):
Add undo using `undo-boundary', disable default undo-boundary
addition.
* lisp/emulation/viper-cmd.el
(viper-complete-complex-command-for-undo,viper-adjust-undo):
Change function name, remove old undo list manipulation.
* lisp/emulation/viper-cmd.el (viper-undo,viper-repeat,
viper-change-state-to-vi,viper-change-state):
Update for function name change.