added idfcalculation parameter to termbank to avoid too much zero
fxied bugs of failure to get wordcount in transaction class
fxied bugs of failure to get wordcount with a wrong index number in transaction class
fxied bugs of failure to compute similiarity in clusterprocessor class
fixed storage bugs of using datastore and several bugs such as assigning wrong group id, out of array index, etc.
fixed bugs that serial datastore cannot hold more than two documents
added a new method to handle sentence inserting task
fixed bugs of seletedToken and multiword japes not running.
completed basic inference component and revised datapreprocessing class a little bit to make it work on test set
added computation of average score for a sentence to program and fixed bugs in data preprocessing class.
deleted group_words table and revised MainApp class
fixed bugs in class clusterprocessor
fixed bugs in class transaction
fixed inserting wrong group words
completed all funcationalities