implement adding options to hosting packages

- fix unique constraints on CustomerDiskSpaceOption and
  CustomerUserDatabaseOption to allow multiple options from the same template
  for hosting packages
- fix disk space calculation in CustomerHostingPackage
- implement hostingpackages forms AddDiskspaceOptionForm, AddMailboxOptionForm,
  AddUserDatabaseOptionForm
- implement hostingpackages.views.AddHostingOption
- add new URL pattern add_hosting_option to hostingpackages.urls
- add template hostingpackages/add_hosting_option.html
- link items on hostingpackages/customerhostingpackage_option_choices.html to
  add_hosting_option

gnuviechadmin/hostingpackages/urls.py

@@ -7,6 +7,7 @@ from __future__ import absolute_import, unicode_literals
 from django.conf.urls import patterns, url
 
 from .views import (
+    AddHostingOption,
     AllCustomerHostingPackageList,
     CreateCustomerHostingPackage,
     CreateHostingPackage,
@@ -26,9 +27,9 @@ urlpatterns = patterns(
         CustomerHostingPackageDetails.as_view(),
         name='hosting_package_details'),
     url(r'^allpackages/',
-        AllCustomerHostingPackageList.as_view(),
-        name='all_hosting_packages'),
+        AllCustomerHostingPackageList.as_view(), name='all_hosting_packages'),
     url(r'^(?P<pk>\d+)/option-choices$',
-        HostingOptionChoices.as_view(),
-        name='hosting_option_choices'),
+        HostingOptionChoices.as_view(), name='hosting_option_choices'),
+    url(r'^(?P<package>\d+)/add-option/(?P<type>\w+)/(?P<optionid>\d+)$',
+        AddHostingOption.as_view(), name='add_hosting_option'),
 )