updated build script, dtm modeling

fixed build script, wrong location for public directory
fixed dtm modeling when a sequence has not enough words for topic name generation
removed analyzer, processor and windowres from config, added to constants instead
updated about page
reworked dtm sequence index, renamed to DTMIndex
fixed reordering of database ids when sequence index sorts by date
added percentage cutoff to dtm topic words
made relative prob cutoff and percentage cutoff optional