remove dependency to django_pandas, not used

django_pandas does not enable the generation of dataframe from
model properties, only from fields


Former-commit-id: 72af7cfae43215f1284df1be8f95cfba1d1bc423

ippisite/ippidb/models.py

 from __future__ import unicode_literals
 
 from django.db import models
-from django_pandas.managers import DataFrameManager
 from django.db.models import Max
 
 from .ws import get_pubmed_info, get_epo_info, get_uniprot_info, get_taxonomy_info, get_go_info, get_pfam_info
@@ -333,8 +332,6 @@ class Compound(models.Model):
     mddr_compound = models.ForeignKey(
         'MDDRCompoundImport', models.CASCADE, blank=True, null=True)
 
-    objects = DataFrameManager()
-
     @property
     def biblio_refs(self):
         """

ippisite/requirements.txt

 Django==1.11
 django-bootstrap3
-django-pandas
 bioservices
 #typing
 django-extensions>=2.0.5