Add command to replace buffer contents
Add a new command 'replace-buffer-contents' that uses the Myers diff algorithm to non-destructively replace the accessible portion of the current buffer. The Myers algorithm is implemented in Gnulib. * src/editfns.c (Freplace_buffer_contents): New command. (set_bit, bit_is_set, buffer_chars_equal): New helper functions. (syms_of_editfns): Define new command. * test/src/editfns-tests.el (replace-buffer-contents-1) (replace-buffer-contents-2): New unit tests. * src/buffer.h (BUF_FETCH_CHAR_AS_MULTIBYTE): New helper macro. * admin/merge-gnulib (GNULIB_MODULES): Add diffseq.h and minmax.h.
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