+ Fixes ispell not noticing allowed words in your personal dictionary.
So +spell/correct would sometimes correct words that spell-fu wasn't
highlighting as incorrect, and sometimes wouldn't correct words that
were.
+ Fixes spell-fu refusing to read or write to the personal dictionary if
the file didn't already exist beforehand (for zq and zw).
+ Change ispell-dictionary fallback from "en_US" (which aspell won't
always recognize) to "en".
+ Moved ispell-personal-dictionary to ~/.emacs.d/.local/etc/ispell/ by
default.