Extend the length of some charfields, per Tom's email

apps/map/models.py

@@ -404,22 +404,16 @@ class CaseStudy(models.Model):
     )
 
     # 1.11
-    project_owners = models.CharField(
+    project_owners = models.TextField(
         verbose_name=_("Project and facility owners"),
-        help_text=_("List companies or organisations that own the project and/or facilities. Separate with a comma."),
-        max_length=120,
-        default=None,
-        null=True,
+        help_text=_("List companies or organisations that own the project and/or facilities. Separate with a new line."),
         blank=True
     )
 
     # 1.12
-    shareholders = models.CharField(
+    shareholders = models.TextField(
         verbose_name=_("Shareholders of the project owners"),
-        help_text=_("List shareholders of the project owners you've just listed. Separate with a comma."),
-        max_length=120,
-        default=None,
-        null=True,
+        help_text=_("List shareholders of the project owners you've just listed. Separate with a new line."),
         blank=True
     )
 
@@ -441,13 +435,10 @@ class CaseStudy(models.Model):
     )
 
     # 1.14
-    energy_customers = models.CharField(
+    energy_customers = models.TextField(
         verbose_name=_("Energy consumers"),
         help_text=_("List any wholesale energy customers that take energy from the development. E.g. 'national \
-                    grids' or private energy suppliers."),
-        max_length=120,
-        default=None,
-        null=True,
+                    grids' or private energy suppliers. Please separate with a newline."),
         blank=True
     )
 
@@ -612,12 +603,9 @@ class CaseStudy(models.Model):
     )
 
     # 2.1.5
-    technical_or_economic_details = models.CharField(
+    technical_or_economic_details = models.TextField(
         verbose_name=_("Additional technical or economic details"),
         help_text=_("Specify any additional technical or economic details relating to the project."),
-        max_length=500,
-        default=None,
-        null=True,
         blank=True
     )
 
@@ -967,12 +955,9 @@ class CaseStudy(models.Model):
     )
 
     # 3.2.4.3
-    participation_mechanisms = models.CharField(
+    participation_mechanisms = models.TextField(
         verbose_name=_("What mechanisms of participation have been used?"),
         help_text=_("e.g. direct action, local referendums, legal cases, letters or petitions etc"),
-        max_length=512,
-        default=None,
-        null=True,
         blank=True
     )