* viper-cmd.el (viper-insert-isearch-string): new function.
(viper-if-string): redefine C-s in the minibuffer to insert the last
incremental search string.
* ediff-init.el (ediff-coding-system): use escape-quoted in case of
XEmacs.
* ediff-merg.el (ediff-merge-region-is-non-clash-to-skip,
ediff-merge-region-is-non-clash,
ediff-skip-merge-region-if-changed-from-default-p): use defun.
Also check if the job is really a merge job.
* ediff.el (ediff-current-file): new function.
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