Updated database shema.
Now the table 'Lemmes' contains the followongg columns:
'Lemme', 'freqlemfilms','freqlemlivres'.
The table 'Flexion' had been stripped of the two preceding columns to allow rarae flexions of lemmes to carry lemme frequency distribution.

The frequency distribution data is derived from Lexique380.

TODO:
Refactor ,clean code and add comments.
Add more functions to process the data.