Provide section that clearly indicates what system query options are allowed on the various combinations of URL type and HTTP method (public comment c201306e00012)

When inserting an entity we already specified that the service MUST return at least the expansion level that was present in the (deep) insert request. As clients should have a complete representation of how the service interpreted their request, the response MUST NOT be projected by the service (this rule is new). Consequently $expand and $select are not allowed on insert requests, and none of the other system query options make sense either. Similar argument for update requests: no system query options on update requests. Delete request don't return data, so no question here. Summary: CUD operations don't allow system query options. The rationale for actions is different: there's no predefined semantics for actions, so all system query options applicable to the return type are allowed. For functions they are allowed anyway.