wip - single contract display

contracts/admin.py

...rations/0003_rename_subtype_contract_subtypes_and_more.py

...ns/0004_contracttype_remove_contract_subtypes_and_more.py

contracts/migrations/0005_rename_type_contract_types.py

contracts/migrations/0006_remove_contract_contains_nda.py

contracts/models.py

contracts/templates/contracts/index.html

contracts/templates/contracts/view_contract.html

contracts/templatetags/subtract.py

contracts/urls.py

contracts/views.py

static_src/admin/contract_form.js