#26 SpellDictionaryDisk has broken string split

[Anonymous]

SpellDictionaryDisk's implemantation of split fails to
return 3 parts when first would be the empty string
(e.g. for ",0,37") -- it returns only 2 strings and
causes an ArrayIndexOutOfBoundsException in loadIndex().

The split on String produces the correct output,
SpellDictionaryDisk should probably use it rather that
implementing it's own split.