lib-fts: Improved stopword file reading. The reading tries to be a little bit stricter now. Only stopwords at the start of a new line are accepted now. Changed fi stopwords accordingly. Also removed superfluous stack allocation in parsing.

lib-fts: Move stopwords to subdirectory. All files incluided in dist are explicitly mentioned. The whole subdirectory 'stopwords' could also be distributed, but that is more error prone.