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(ispell-internal-change-dictionary): When flyspell-mode is active and
dictionary is changed, make sure ispell process is restarted and
flyspell word cache cleared out for the current buffer.
(ispell-change-dictionary): Make sure flyspell word cache is cleared
out in all buffers with active flyspell mode when dictionary is globally
changed.  Call ispell-internal-change-dictionary after dictionary change.