om the documents in a given
 directory.  Assumes that the file names for the documents end with
 ".txt".  Assumes that files containing corresponding
 author-assigned keyphrases end with ".key". Optionally an encoding
 for the documents/keyphrases can be defined (e.g. for Chinese
 text).

 Valid options are:<p>

 -l "directory name"<br>
 Specifies name of directory.<p>

 -m "model name"<br>
 Specifies name of model.<p>

 -e "encoding"<br>
 Specifies encoding.<p>

 -d<br>
 Turns debugging mode on.<p>

 -k<br