Clean up old files
Hashtag prediction improvements

The following improvements were added: lower case insensitivity,
#agenda, #svtagenda and #pldebat hashtags, special character removal.
Internal data path change

The internal data path was changed to an external hard drive.
Tagging run

Tagging was called for all agenda topics. A test for tagging was
implemented.
Tf-idf run

The tf-idf was run on different topics.