textmodes/ispell.el: Look for aspell .dat files also under dict-dir, as aspell does.
Originally reported as http://bugs.debian.org/765349. Noticed when aspell has different data-dir and dict-dir. * textmodes/ispell.el (ispell-aspell-find-dictionary): Make sure .dat files for aspell dicts are also searched for in location described by `ispell-aspell-dict-dir', matching aspell's dict-dir variable.
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