* Add 300 response for overloaded functions with same argument names but different types
* Add Path type to handle validations and errors before defining the Target
* openapi-mode="follow-acl"(default): follows access control for the
JWT role.
* openapi-mode="ignore-acl": ignores access control for the JWT role.
* openapi-mode="disabled": disables OpenAPI output, the root endpoint
replies with 404 Not Found.
The request.spec GUC contains the schema cache structure in json.
It's only available when the root endpoint(/) is requested and when
db-root-spec is not empty.
Also correct db-root-spec to accept a schema.
Allows using header "Prefer=headers-only" explicitly to get a response with only a Location header.
BREAKING CHANGE: Change default for POST request from headers-only to minimal
Resolves#1656
monacoremo