[FIX] Removing old database connexion configuration.

analysis/diachronic_specificity.py

 import sqlalchemy
-from gargantext_web import api
+from gargantext_web import api, db
 from node import models
 from sqlalchemy import create_engine
 from sqlalchemy.sql import func
 import numpy as np
 import collections
 
-ResourceType = models.ResourceType.sa
-Resource = models.Resource.sa
-NodeType = models.NodeType.sa
-NodeNgram = models.Node_Ngram.sa
-NodeNodeNgram = models.NodeNodeNgram.sa
-NodeNgramNgram = models.NodeNgramNgram.sa
-Ngram = models.Ngram.sa
-Node_Hyperdata = models.Node_Hyperdata.sa
-Hyperdata = models.Hyperdata.sa
-Node = models.Node.sa
-Corpus = models.Corpus.sa
-
-def get_session():
-    import sqlalchemy.orm
-    from django.db import connections
-    from sqlalchemy.orm import sessionmaker
-    from aldjemy.core import get_engine
-    alias = 'default'
-    connection = connections[alias]
-    engine = create_engine("postgresql+psycopg2://gargantua:C8kdcUrAQy66U@localhost/gargandb",
-            use_native_hstore=True)
-    Session = sessionmaker(bind=engine)
-    return Session()
 
 session = get_session()
 
-
 def result2dict(query):
     results = dict()
     for result in query: