* find/exec.c (initialise_wd_for_exec): rename to
initialize_wd_for_exec, since "initialize" is the preferred form
even in UK spelling (the OED says "initialise" is a variant).
Update callers (it's a static function). Update spelling in
comments.
* find/find.c (main): Fix missing "to" in error message and update
"initialise" to "initialize". Update comment too.
* find/ftsfind.c (main): Update spelling in error message.
* lib/listfile.c (print_name_with_quoting): spelling change in
comment.
* find/tree.c (init_pred_perf): Likewise.
* lib/extendbuf.c (extendbuf): Likewise.
* lib/splitstring.h: Likewise.
* find/print.c (format_date): Likewise.
* doc/find-maint.texi (Tools): Update spelling.
* lib/splitstring.c: New file; defines splitstring(), which will
non-destructively locate character-separated fields in a string.
* lib/splitstring.h: New file; declares splitstring.
* lib/test_splitstring.c: New file; unit test for splitstring.c.
* lib/nextelem.c: Delete (obsoleted by splitstring.c).
* lib/nextelem.h: Delete (obsoleted by splitstring.h).
* lib/Makefile.am (libfind_a_SOURCES): Add splitstring.c,
splitstring.c. Remove nextelem.c, nextelem.h.
(check_PROGRAMS): Add test_splitstring.
(TESTS): Add test_splitstring.
(test_splitstring_SOURCES): Sources for the
test_splitstring unit test.
* locate/locate.c: Include splitstring.h rather than nextelem.h.
(dolocate): Use splitstring rather than next_element. In places
where we need a nul-terminated string, use strndup() to create it.
Convert some space-tab sequences to regular spacing.
* find/parser.c: Include splitstring.h rather than nextelem.h.
(check_path_safety): Use splitstring rather than next_element.
* import-gnulib.config (modules): Depend on the module strndup.
* cfg.mk: Exempt lib/test_splitstring.c from calling
bindtextdomain or set_program_name.
