change Compound's type from CharField to TextField

WIP on #205

ippisite/ippidb/migrations/0047_auto_20200416_1359.py

+# Generated by Django 2.2.1 on 2020-04-16 13:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ippidb', '0046_compoundjob'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='compound',
+            name='iupac_name',
+            field=models.TextField(blank=True, null=True, verbose_name='IUPAC name'),
+        ),
+    ]

ippisite/ippidb/models.py

@@ -717,8 +717,8 @@ class Compound(AutoFillableModel):
     chembl_id = models.CharField(
         verbose_name="Chembl ID", max_length=30, blank=True, null=True
     )
-    iupac_name = models.CharField(
-        verbose_name="IUPAC name", max_length=255, blank=True, null=True
+    iupac_name = models.TextField(
+        verbose_name="IUPAC name", blank=True, null=True
     )
     ligand_id = models.CharField("PDB Ligand ID", max_length=3, blank=True, null=True)
     pubs = models.IntegerField(