Another revision for autodoc tracking of public vs private interfaces

A script's public API wasn't simply definable as identifiers
for which ID::IsGlobal() is true, e.g. an unexported identifier with
SCOPE_MODULE will still pass that test and (incorrectly) be considered
public API.

Also, generated reST now omits empty interface sections.

src/BroDoc.h

@@ -242,6 +242,9 @@ private:
 	 * @param a reference to a list of BroDocObj pointers
 	 */
 	void FreeBroDocObjPtrList(std::list<const BroDocObj*>& l);
+
+	static bool IsPublicAPI(const BroDocObj* o) { return o->IsPublicAPI(); }
+	static bool IsPrivateAPI(const BroDocObj* o) { return ! o->IsPublicAPI(); }
 };
 
 #endif