unify message page and search page result list view
update todo
do not send topic_fuzzy query after fuzzy query,since fuzzy query already contains topic_fuzzy result
update TODO
change some html value
add basic query by topic support
change cross-index class to topic
impl topic search
do not add dup message to search result list, optimize topic search a little

   if search length is MAX_CROSS_INDEX_LENGTH, do not post TOPIC_FUZZY query,
for it must be same result
rename MAX_CROSS_INDEX_xx to MAX_TOPIC_xx