add MessageMap::findAll changedSince argument to distinguish touched/changed for since/until range

src/lib/ebus/message.h

@@ -1403,11 +1403,12 @@ class MessageMap : public MappedFileReader {
    * address), or 0 to ignore.
    * @param until the end time to which to add updates (exclusive, also removes messages with unset destination
    * address), or 0 to ignore.
+   * @changedSince true to use the last change time for the since/until range, false to use the last seen time.
    * @param messages the @a deque to which to add the found @a Message instances.
    */
   void findAll(const string& circuit, const string& name, const string& levels,
     bool completeMatch, bool withRead, bool withWrite, bool withPassive, bool includeEmptyLevel, bool onlyAvailable,
-    time_t since, time_t until, deque<Message*>* messages) const;
+    time_t since, time_t until, bool changedSince, deque<Message*>* messages) const;
 
   /**
    * Find the @a Message instance for the specified master data.