WORD_TYPES_HIDDEN shouldn't be considered META by default.

WORD_TYPES_HIDDEN shouldn't be considered META by default.

WT_LINK shouldn't be considered accent-less. This might cause sherlockd
to fail to find matches in link texts from non-accented documents to
accented ones, but I think that it's more acceptable than producing
false matches. Unfortunately, we how no ways to describe accentedness
of a part of document text.