Implement account-template-add, and render from a saved template

cmd/rednerd/admin_password.go

database/bindata.go

database/migrations/0004_add_template_table.up.sql

database/sql.go

models/template.go

models/template_db.go

models/template_db_test.go

restapi/configure_rednerd.go

restapi/embedded_spec.go

restapi/handlers/account-template-add.go

restapi/handlers/render.go

restapi/handlers/user-add.go

restapi/handlers/user-delete.go

restapi/operations/logging.go

restapi/operations/prometheus.go

restapi/operations/rednerd_api.go

...pi/operations/template_management/account_template_add.go

...ns/template_management/account_template_add_parameters.go

...ns/template_management/account_template_add_prometheus.go

...ons/template_management/account_template_add_responses.go