Change the Edit Distance EDA configuration files so that the created models (i.e. thershold values) are saved as part of the configuration files.

Change FixedWeightEditDistance to solve issue 274: stop words are not removed when the basic configuration is selected.
Update the javadoc of the setmSubstituteWeight method in FixedWeightEditDistance
Merge pull request #318 from rzanoli/master

Change the Edit Distance EDA configuration files mechanism