Merge pull request #2795 from HyphaApp/invoicing-improvement

hypha/apply/activity/messaging.py

hypha/apply/dashboard/views.py

hypha/apply/projects/forms/payment.py

.../apply/projects/migrations/0050_add_new_invoice_status.py

...migrations/0051_remove_unnecessary_fields_from_invoice.py

hypha/apply/projects/models/payment.py

hypha/apply/projects/tables.py

...cts/templates/application_projects/includes/invoices.html

...emplates/application_projects/invoice_confirm_delete.html

...ojects/templates/application_projects/invoice_detail.html

hypha/apply/projects/tests/factories.py

hypha/apply/projects/tests/test_forms.py

hypha/apply/projects/tests/test_models.py

hypha/apply/projects/tests/test_views.py

hypha/apply/projects/views/payment.py

hypha/apply/projects/views/project.py